Why is the Data Store in my game not saving the Players Stats?

Hello, I have been stuck with this glitch for ages. I've tried everything to save stats on my games, but there is no 100% working save, which upsets me as I have literally done everything I could and spent over a year trying to solve this kind of glitch. I have lately decided to convert to a Data Store since I got told that might work, however even the Data Store isn't working.. The idea of my game is for the Player to have 3 Stats which will save; Their Level, Experience and their Genetics. It wasn't saving at first, but I got told I need to activate API Access, which I have done but now the Stats don't save at all.. Could someone please either help me fix the script or make a new one involving the 3 stats mentioned above inside a Folder in the Player called "LevelData"? I would be very grateful and would be happy to pay you ROBUX for it after making sure it doesn't break or have flaws. I know this might be a big ask but I sometimes feel like ROBLOX deliberately singles out my games so that the data never saves, but will save perfectly on everyone else's, even if they lose connection. This is the Data Store I recently made:

local module = {}
local Storage = game:GetService('DataStoreService'):GetDataStore('StatHolder')

game.Players.PlayerAdded:connect(function(player)
	local le = Instance.new("Folder")
	le.Name = "LevelData"
	le.Parent = player
	local Exp = Instance.new("NumberValue")
	Exp.Name = "Exp"
	Exp.Parent = le
	Exp.Value = 0
	local SavedExp = Storage:GetAsync(player.userId.."-Exp")
	if SavedExp ~= nil then
		Exp.Value = SavedExp
	end
	local Level = Instance.new("NumberValue")
	Level.Name = "Level"
	Level.Parent = le
	Level.Value = 0
	local SavedLevel = Storage:GetAsync(player.userId.."-Level")
	if SavedExp ~= nil then
		Level.Value = SavedLevel
	end
	local Genetics = Instance.new("NumberValue")
	Genetics.Name = "Genetics"
	Genetics.Parent = le
	Genetics.Value = math.random(1,100)
	local SavedGenetics = Storage:GetAsync(player.userId.."-Genetics")
	if SavedGenetics ~= nil then
		Genetics.Value = SavedGenetics
	end
	while true do
		wait(0.1)
		if Exp.Value > 10000000 then
			Exp.Value = 10000000
		end
		Exp.Changed:connect(function()
			Level.Value = math.floor(Exp.Value / 1000)
		end)
end
end)

game.Players.PlayerRemoving:connect(function(player)
	local id = player.userId
	local ExpValue = player.LevelData.Exp.Value
	Storage:SetAsync(id.. "-Exp", ExpValue)
	local LevelValue = player.LevelData.Level.Value
	Storage:SetAsync(id.. "-Level", LevelValue)
	local GeneticsValue = player.LevelData.Genetics.Value
	Storage:SetAsync(id.. "-Genetics", GeneticsValue)
end)
return module

This is a Module script inside a Script in the ServerScriptService which is simply a 1 line script that requires the ModuleScript:

require(script:WaitForChild('ModuleScript'))

As luke said, pcall. You probably didn't enable in-studio api's either. pcall is this:

pcall(function()

end)

Any errors inside this will not halt the script, and rather will cancel the pcall. If we build on that,

local Success, Val = pcall(function()
	return Value * 2
end)

We can detect if it was successful or not. 'Val' will also be Value * 2, as there is a return. I hope this helped you a bit.