I need this to be able to save and load, but it shows no errors and isn't working. Can anyone Help?

I tried a lot of resources, but I am unable to make the gold, tool hardness, tool power, or spaces save. I would like it to save when a player leaves, and load when a player joins. I tried to get it to save and load, but It still doesn't work, nor show any sort of error, so i don't know what's wrong. It would be a huge help if this could save/load. also, everything below this is my code. the script is in the ServerScriptService

    -- Creates a leaderboard that shows player variables
   local Players = game:GetService("Players")
	local goldDataStore = game:GetService("DataStoreService"):GetDataStore("Data0")


 local function onPlayerJoin(player)
	
	local playerKey = "Player_" .. player.UserId
	
    	local leaderstats = Instance.new("Folder")
    	leaderstats.Name = "leaderstats"
		leaderstats.Parent = player

     

    	local gold = Instance.new("IntValue", leaderstats)
    	gold.Name = "Gold"

local startgold = 0


game.Players.PlayerAdded:Connect(function()
	local myGold= goldDataStore:GetAsync(playerKey,{player.leaderstats.Gold.Value
	})
		gold.Value = myGold
end)





    	local Items= Instance.new("IntValue")
    	Items.Name = "Items"
    	Items.Value = 0
    	Items.Parent = leaderstats



    	local Spaces = Instance.new("IntValue")
    	Spaces.Name = "Spaces"
    	Spaces.Value = 2
    	Spaces.Parent = leaderstats



		local Values = Instance.new("Folder")
		Values.Name = "Values"
		Values.Parent = player
		

		
	 local Toolhardness = Instance.new("IntValue")
	Toolhardness.Name = "ToolHardness"
	Toolhardness.Value = 1
	Toolhardness.Parent = Values
	

	 local ToolPower = Instance.new("IntValue")
	ToolPower.Name = "ToolPower"
	ToolPower.Value = 1
	ToolPower.Parent = Values
	
	
end
	
     
    -- Run onPlayerJoin when the PlayerAdded event fires
  

for _, player in pairs(Players:GetPlayers()) do
	onPlayerJoin(player)
end


  game.Players.PlayerAdded:Connect(onPlayerJoin)

   local Players = game:GetService("Players")
	
	
	local goldDataStore = game:GetService("DataStoreService"):GetDataStore("Data0")

local function Saveonleave(player)
	
	   local playerKey = "Player_" .. player.UserId
	
	   goldDataStore:SetAsync(playerKey,{
	player.leaderstats.Gold.Value
	})


end

game.Players.PlayerRemoving:Connect(Saveonleave)