how can I change my local script to fit this datastore?

I'm pretty sure this is the problem. I made a datastore script that goes like this:

local DataStoreService = game:GetService("DataStoreService")
local MyDataStore = DataStoreService:GetDataStore("myDataStore")


game.Players.PlayerAdded:Connect(function(player)

	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player
 
	-- Display an 'IntValue' on leaderboard
	local cash = Instance.new("IntValue")
	cash.Name = "Cash"
	cash.Parent = leaderstats
	




	local data
	local success, errormessage = pcall(function()
	
		 data = MyDataStore:GetAsync(player.UserId.."-cash") or 0
	end)
	
		
	if success then
		
		cash.Value = data
	else
			print("error")
			warn(errormessage)
	end
end)






game.Players.PlayerRemoving:Connect(function(player)
	local success, errormessage = pcall(function()
	MyDataStore:SetAsync(player.UserId.."-cash",player.leaderstats.Cash.Value) 
	
	end)
	if success then print("Data Saved")
		else print("error")
			warn("errormessage")
			
	end
	
	
	
	
	
end)

If I play my game on Roblox (not studio) I am able to save the value of cash if I type a command from HD admin.

Change me Cash 1000

I leave the game and this is saved and remains when I come back. However, I have a localscript in StarterPlayerScripts that is:

while true do
 wait(10)
game.Players.LocalPlayer.leaderstats.Cash.Value = game.Players.LocalPlayer.leaderstats.Cash.Value + 10
  end

The 1000 will go (ex.1040) and it won't save.
I can use the admin command to change the value to 1040 and it saves. What can I do to fix this?