How to restart a script that is running?

I'm trying to make a resource gathering AI model that collects resources from bricks. I need help with making the script restart after it has been executed once. The model moves to the resource block, shoots a beam at it and then when its full it moves to 3 checkpoints (Part 1 is the start, Part 2 is the middle/ resource dropoff, and Part 3 is the end). After it gets to part 3 it no longer works and is still looping through the second while true do loop. How could I restart the script or set up the script so it could work multiple times nomatter what. Thanks for helping!!! I don't know If I could set up some kind of coroutine to do this but if that's what you think I should do then let me know (I would probably need help with that)..Thanks

while true do
	
	wait(1)

		workspace.DeadUnits:WaitForChild("PlasticBlob")

		local Mag = (script.Parent.Torso.Position - 				workspace.DeadUnits.PlasticBlob.Blob.Position).magnitude

		print (Mag)
	

			if Mag > 15 then
			
				for i,v in pairs (workspace.DumpTruck.DumpTruck:GetChildren()) do
		
				if v:IsA "Part" then
			
				v.Anchored = false
			
				script.Parent.Humanoid:MoveTo(workspace.DeadUnits.PlasticBlob.Blob.Position)

			print "Far away"
		
		end
	end
end
			
	
		
		
if Mag < 15 then do
	
	
	for i,v in pairs (workspace.DumpTruck.DumpTruck:GetChildren()) do
		
		if v:IsA "Part" then
			
		v.Anchored = true
		
		local tool = workspace.DumpTruck.DumpTruck.Gun

			while true do
		
			wait (1)	
	
			print "While true do #2 is running"
	
			workspace.DeadUnits:WaitForChild("PlasticBlob")
	
			local Mag = (script.Parent.Torso.Position - 			workspace.DeadUnits.PlasticBlob.Blob.Position).magnitude

		
		local tool = workspace.DumpTruck.DumpTruck.Gun
		
		local Target = workspace.DeadUnits.PlasticBlob.Blob
	
	
		
		
		if tool.Parent.ResourceCarry.Value >= 0 and tool.Parent.ResourceCarry.Value < 50 and Mag < 15 then
		
		local ignore = game.Players.LocalPlayer.Character
		
		local ray = Ray.new(tool.CFrame.p, (Target.Position - tool.CFrame.p).unit * 300)
		local part, position = workspace:FindPartOnRay(ray, ignore)
 
		local beam = Instance.new("Part", workspace)
		beam.BrickColor = BrickColor.new("Bright red")
		beam.FormFactor = "Custom"
		beam.Material = "Neon"
		beam.Transparency = 0.25
		beam.Anchored = true
		beam.Locked = true
		beam.CanCollide = false
 
		local distance = (tool.CFrame.p - position).magnitude
		beam.Size = Vector3.new(0.3, 0.3, distance)
		beam.CFrame = CFrame.new(tool.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)
		
		game:GetService("Debris"):AddItem(beam, 1)
		
		wait (1)
		
		--Fix lazer beam staying there after its full, make resource brick dissipear
		Target.ResourceOnDeath.Value = Target.ResourceOnDeath.Value - 1
		
		
		tool.Parent.ResourceCarry.Value = tool.Parent.ResourceCarry.Value + 1
		
		if 	tool.Parent.ResourceCarry.Value == 50 then
		
			
			v.Anchored = false
			
			workspace.DumpTruck.DumpTruck.Humanoid:MoveTo(workspace.Part1.Position) 
			
			print "Full and moving to Part 1"
			
			workspace.Part1.Touched:connect(function()
			
			workspace.DumpTruck.DumpTruck.Humanoid:MoveTo(workspace.Part2.Position) 
			
			workspace.Part2.Touched:connect(function()
			
			print "Resources Gathered!!"
	
			workspace.DumpTruck.DumpTruck.ResourceCarry.Value = 0
	
			workspace.DumpTruck.DumpTruck.Humanoid:MoveTo(workspace.Part3.Position)
			
			workspace.Part3.Touched:connect(function()
			
			--RESTART SCRIPT 
				
			end)
		end)
	end
end
end
end
end
end
end
end

The easiest way would probably be to use a function and not have the whole script in a while loop, that way you can just call upon the start of that function whenever you need it.

Restarting a script is a sign of a larger underlying problem. Here it appears to be nested infinite loops. You can break loops with break. However, rather than use nested loops, you can try implementing a state behavior.

An example:

local searchState = 0
local gatherState = 1
local dumpState = 2

local state = searchState

while wait(1) do
	if state == searchState then
		--Search for resources
		if resourceFound then
			state = gatherState
		end
	elseif state == gatherState then	
		--Gather resources
		if inventoryFull then
			state = dumpState
		elseif resourceDepleted then
			state = searchState
		end
	elseif state == dumpState then
		--Return and dump resources
		if hasDumped then
			state = searchState
		end
	else
		warn("Invalid State!")
		state = searchState
	end
end