How would I use game.OnClose to save data?

So my datastore doesn't save all the variables when the last player leaves so when the player would buy ingame purchases using R$ it won't always save

-- Player Profile creator
	local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerStats")
	
game.Players.PlayerAdded:connect(function(plr)
	local profile = Instance.new("Folder")
	profile.Parent = game.Workspace.PlayerProfiles
	profile.Name = plr.Name
	
	local profile2 = Instance.new("NumberValue")
	profile2.Name = "BuyableCurrency"
	profile2.Parent = profile
	
	--loading stats
	
--plr:WaitForDataReady()
wait(2)
local stats2 = game.Workspace.PlayerProfiles:FindFirstChild(plr.Name):GetChildren()
for i = 1, #stats2 do
stats2[i].Value = DataStore:GetAsync(stats2[i].Name)
print(stats2[i].Value)
if p12.Value == 0 then
	p12.Value = 15
end
end
end)




game.Players.PlayerRemoving:connect(function(plr2)
	local stats = game.Workspace.PlayerProfiles:FindFirstChild(plr2.Name):GetChildren()
	
	for i=1, #stats do 
		print(stats[i].Name)
		DataStore:SetAsync(stats[i].Name, stats[i].Value)
	end
end)

what I'm trying to do is when the game is closing to have a different way of saving the last players values without an issue occuring

how would I use

Game.OnClose = function()

in this case to save player variables in a datastore?