How to reward upon completiion of round?

So I'm trying to reward xp upon completion of a game. However nothing is working, so I have no idea what im doing right/wrong. Can someone please explain this to me

RoundService

local roundtime = 15
local roundStopped = false
player = game.StarterPlayer.StarterPlayerScripts.Parent
local Humanoid = player:findFirstChild("Humanoid")
local tag = Humanoid:findFirstChild("creator") 
local leaderstats = tag.Value:findFirstChild("leaderstats") 

while true do
	print("Round starting...")
	for i = roundtime,0,-1 do
		if roundStopped then break end
		print(i.." seconds left")
		wait(1)
	end
	roundStopped = false
	print("Round finished")
end

workspace["RedKing"].Humanoid.Died:Connect(function()
	roundStopped = true
	leaderstats.Games.Value = leaderstats.Games.Value + 1
	leaderstats.XP.Value = leaderstats.XP.Value + 150
end)

workspace["BlueKing"].Humanoid.Died:Connect(function()
	roundStopped = true
	leaderstats.Games.Value = leaderstats.Games.Value + 1
	leaderstats.XP.Value = leaderstats.XP.Value + 150
	
end)

Leaderstats

game.Players.PlayerAdded:connect(function(Player)
	local leaderstats = Instance.new("IntValue",Player)
	leaderstats.Name = "leaderstats"
	local XP = Instance.new("IntValue",leaderstats)
	XP.Name = "XP" 
	XP.Value = 0
	local Level = Instance.new("IntValue",leaderstats)
	Level.Name = "Level" 
	Level.Value = 1 
	local Games = Instance.new("IntValue",leaderstats)
	Games.Value = 0
	Games.Name = "Games Played"
	
	XP.Changed:connect(function() XPChange(Player,XP,Level) end)
	
end)

function XPChange(Player,XP,Level) 
	if XP.Value >= Level.Value*150  then
		XP.Value = 0 
		Level.Value = Level.Value+ 1
	end
end

xp gain starterplayerscript

local Humanoid = script.Parent.Humanoid
function PwntX_X() 
local tag = Humanoid:findFirstChild("creator") 
	if tag ~= nil then 
		if tag.Value ~= nil then 
local leaderstats = tag.Value:findFirstChild("leaderstats") 
			if leaderstats ~= nil then 
leaderstats.XP.Value = leaderstats.XP.Value + 10
wait(0.1) 
script:remove()
			end 
		end 
	end 
end 
Humanoid.Died:connect(PwntX_X)