What did I do wrong in this stage randomizer script?

Hey everyone, so I wrote this script for a stage randomizer, but when it chooses stage 5 it stays stuck and doesn't change after a minute anymore, does anyone know/see why this happens? (i added a few more if pickedmap ~= nil then because it was doing an error, my problem is not because of this, because it also didnt change away from stage 5 before i added the if ~= nil then) The script:

while true do
	local pickedmap = math.random(1,5)
	print(pickedmap)
	wait(2)
	print(pickedmap)
	if pickedmap ~= nil then
		pickedmap = math.random(1,5)
		print(pickedmap)
	end
	if pickedmap == 1 then
		if pickedmap ~= nil then
			pickedmap = math.random(1,5)
			print(pickedmap)
		end
		workspace.Dodge.parts.Transparency = 0
		workspace.Dodge.parts.CanCollide = true
		workspace.Dodge.killparts.Transparency = 0
		workspace.Dodge.killparts.Script.Disabled = false
		
		wait(60)
		
		workspace.Dodge.parts.Transparency = 1
		workspace.Dodge.parts.CanCollide = false
		workspace.Dodge.killparts.Transparency = 1
		workspace.Dodge.killparts.Script.Disabled = true
	end
	if pickedmap == 2 then
		if pickedmap ~= nil then
			pickedmap = math.random(1,5)
			print(pickedmap)
		end
		workspace.Topjump.conveyors.a.Transparency = 0
		workspace.Topjump.conveyors.b.Transparency = 0
		workspace.Topjump.conveyors.a.CanCollide = true
		workspace.Topjump.conveyors.b.CanCollide = true
		workspace.Topjump.part.CanCollide = true
		workspace.Topjump.part.Transparency = 0.3
		workspace.Topjump.killparts.Script.Disabled = false
		workspace.Topjump.killparts.Transparency = 0
		
		wait(60)
		
		workspace.Topjump.conveyors.a.Transparency = 1
		workspace.Topjump.conveyors.b.Transparency = 1
		workspace.Topjump.conveyors.a.CanCollide = false
		workspace.Topjump.conveyors.b.CanCollide = false
		workspace.Topjump.part.CanCollide = false
		workspace.Topjump.part.Transparency = 1
		workspace.Topjump.killparts.Script.Disabled = true
		workspace.Topjump.killparts.Transparency = 1
	end
	if pickedmap == 3 then
		if pickedmap ~= nil then
			pickedmap = math.random(1,5)
			print(pickedmap)
		end
		workspace.Pushingaway.conveyors.a.Transparency = 0
		workspace.Pushingaway.conveyors.b.Transparency = 0
		workspace.Pushingaway.conveyors.c.Transparency = 0
		workspace.Pushingaway.conveyors.d.Transparency = 0
		workspace.Pushingaway.conveyors.e.Transparency = 0
		workspace.Pushingaway.conveyors.f.Transparency = 0
		workspace.Pushingaway.conveyors.g.Transparency = 0
		workspace.Pushingaway.conveyors.h.Transparency = 0
		workspace.Pushingaway.conveyors.a.CanCollide = true
		workspace.Pushingaway.conveyors.b.CanCollide = true
		workspace.Pushingaway.conveyors.c.CanCollide = true
		workspace.Pushingaway.conveyors.d.CanCollide = true
		workspace.Pushingaway.conveyors.e.CanCollide = true
		workspace.Pushingaway.conveyors.f.CanCollide = true
		workspace.Pushingaway.conveyors.g.CanCollide = true
		workspace.Pushingaway.conveyors.h.CanCollide = true
		workspace.Pushingaway.part.CanCollide = true
		workspace.Pushingaway.part.Transparency = 0
		workspace.Pushingaway.killparts.Script.Disabled = false
		workspace.Pushingaway.killparts.Transparency = 0
		
		wait(60)
		
		workspace.Pushingaway.conveyors.a.Transparency = 1
		workspace.Pushingaway.conveyors.b.Transparency = 1
		workspace.Pushingaway.conveyors.c.Transparency = 1
		workspace.Pushingaway.conveyors.d.Transparency = 1
		workspace.Pushingaway.conveyors.e.Transparency = 1
		workspace.Pushingaway.conveyors.f.Transparency = 1
		workspace.Pushingaway.conveyors.g.Transparency = 1
		workspace.Pushingaway.conveyors.h.Transparency = 1
		workspace.Pushingaway.conveyors.a.CanCollide = false
		workspace.Pushingaway.conveyors.b.CanCollide = false
		workspace.Pushingaway.conveyors.c.CanCollide = false
		workspace.Pushingaway.conveyors.d.CanCollide = false
		workspace.Pushingaway.conveyors.e.CanCollide = false
		workspace.Pushingaway.conveyors.f.CanCollide = false
		workspace.Pushingaway.conveyors.g.CanCollide = false
		workspace.Pushingaway.conveyors.h.CanCollide = false
		workspace.Pushingaway.part.CanCollide = false
		workspace.Pushingaway.part.Transparency = 1
		workspace.Pushingaway.killparts.Script.Disabled = true
		workspace.Pushingaway.killparts.Transparency = 1
	end	
	if pickedmap == 4 then
		if pickedmap ~= nil then
			pickedmap = math.random(1,5)
			print(pickedmap)
		end
		workspace.Workingback.Conveyors.a.Transparency = 0
		workspace.Workingback.Conveyors.b.Transparency = 0
		workspace.Workingback.Conveyors.c.Transparency = 0
		workspace.Workingback.Conveyors.d.Transparency = 0
		workspace.Workingback.Conveyors.e.Transparency = 0
		workspace.Workingback.Conveyors.f.Transparency = 0
		workspace.Workingback.Conveyors.g.Transparency = 0
		workspace.Workingback.Conveyors.a.CanCollide = true
		workspace.Workingback.Conveyors.b.CanCollide = true
		workspace.Workingback.Conveyors.c.CanCollide = true
		workspace.Workingback.Conveyors.d.CanCollide = true
		workspace.Workingback.Conveyors.e.CanCollide = true
		workspace.Workingback.Conveyors.f.CanCollide = true
		workspace.Workingback.Conveyors.g.CanCollide = true
		workspace.Workingback.killparts.Script.Disabled = false
		workspace.Workingback.killparts.Transparency = 0
		workspace.Workingback.parts.Transparency = 0
		workspace.Workingback.parts.CanCollide = true
		
		wait(60)
		
		workspace.Workingback.Conveyors.a.Transparency = 1
		workspace.Workingback.Conveyors.b.Transparency = 1
		workspace.Workingback.Conveyors.c.Transparency = 1
		workspace.Workingback.Conveyors.d.Transparency = 1
		workspace.Workingback.Conveyors.e.Transparency = 1
		workspace.Workingback.Conveyors.f.Transparency = 1
		workspace.Workingback.Conveyors.g.Transparency = 1
		workspace.Workingback.Conveyors.a.CanCollide = false
		workspace.Workingback.Conveyors.b.CanCollide = false
		workspace.Workingback.Conveyors.c.CanCollide = false
		workspace.Workingback.Conveyors.d.CanCollide = false
		workspace.Workingback.Conveyors.e.CanCollide = false
		workspace.Workingback.Conveyors.f.CanCollide = false
		workspace.Workingback.Conveyors.g.CanCollide = false
		workspace.Workingback.killparts.Script.Disabled = true
		workspace.Workingback.killparts.Transparency = 1
		workspace.Workingback.parts.Transparency = 1
		workspace.Workingback.parts.CanCollide = false
	end
	if pickedmap == 5 then
		if pickedmap ~= nil then
			pickedmap = math.random(1,5)
			print(pickedmap)
		end
		workspace.Speedpush.conveyors.a.Transparency = 0
		workspace.Speedpush.conveyors.b.Transparency = 0
		workspace.Speedpush.conveyors.c.Transparency = 0
		workspace.Speedpush.conveyors.d.Transparency = 0
		workspace.Speedpush.conveyors.e.Transparency = 0
		workspace.Speedpush.conveyors.a.CanCollide = true
		workspace.Speedpush.conveyors.b.CanCollide = true
		workspace.Speedpush.conveyors.c.CanCollide = true
		workspace.Speedpush.conveyors.d.CanCollide = true
		workspace.Speedpush.conveyors.e.CanCollide = true
		workspace.Speedpush.Part.Transparency = 0
		workspace.Speedpush.Part.CanCollide = true
		workspace.Speedpush.killparts.Script.Disabled = false
		workspace.Speedpush.killparts.Transparency = 0
		
		wait(60)
		
		workspace.Speedpush.conveyors.a.Transparency = 1
		workspace.Speedpush.conveyors.b.Transparency = 1
		workspace.Speedpush.conveyors.c.Transparency = 1
		workspace.Speedpush.conveyors.d.Transparency = 1
		workspace.Speedpush.conveyors.e.Transparency = 1
		workspace.Speedpush.conveyors.a.CanCollide = false
		workspace.Speedpush.conveyors.b.CanCollide = false
		workspace.Speedpush.conveyors.c.CanCollide = false
		workspace.Speedpush.conveyors.d.CanCollide = false
		workspace.Speedpush.conveyors.e.CanCollide = false
		workspace.Speedpush.Part.Transparency = 1
		workspace.Speedpush.Part.CanCollide = false
		workspace.Speedpush.killparts.Script.Disabled = true
		workspace.Speedpush.killparts.Transparency = 1
	end
	if pickedmap ~= nil then
		pickedmap = math.random(1,5)
		print(pickedmap)
	end

end

I'm not even going to bother trying to scan through all those lines for an error lol. However, I'll write up a basic code for you that you can use as a template:

--// Services:
local _RS = game:GetService("ReplicatedStorage");

--// References:
local maps = _RS:WaitForChild("Maps"):GetChildren();

--// Variables:
local roundDuration = 10 -- Time (in seconds) that rounds take. 10 IS VERY SHORT!
local intermission = 15 -- Break (in seconds) between rounds

--// Cached Functions:
local random = math.random;

--// Core:
while true do
	
	local pickedMap = maps[random(1,#maps)]:clone()

	wait(intermission);

	pickedMap.Parent = game.Workspace;

	if pickedMap.Name == "Whatever Map Name" then
		--Do stuff according to the specific map
	elseif pickedMap.Name == "Whatever Map Name" then
		--Do stuff according to the specific map
	end

	wait(roundDuration);

	--Teleport players back to lobby or whatever

	pickedMap:Destroy();
	
end

ok you should do something like this if u cant understand i can say what this do

DONT FORGET TO PUT IT ON A SCRIPT

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local Maps = ReplicatedStorage.Maps:GetChildren()
local Parent = workspace -- this is the parent of map when map choose

local InGameMap -- dont change or remove this

math.randomseed(tick())

while true do
	if InGameMap then
		InGameMap:Destroy()
	end

	local RandomNumber = math.random(1, #Maps) -- this is choose a random map between 5 map and #Maps get the maps we have like 5 - 6 - 7 - 10
	
	local Map = Maps[RandomNumber] -- this line choose the Map it get the map

	InGameMap = Map:Clone() -- this line clone the choosed map
	InGameMap.Parent = Parent -- this line put the cloned map on workspace u can put it on everywhere u want. Only choose the Parent Variable

	wait(20) -- this is how much a round take u can change it
end