What's the best way of preventing any possible errors when saving via DataStore?

I have a player counter for other places within my game. At first, it wasn't that big of an issue that we were dealing with after a few edits I had done. We were only off +1-2 on the DataStore. But then, it started to get worse. Like yesterday, we had 103 people visit, which made it say, today, that there were 8 people on when only 2 were on. Changing the key over and over is starting to not work anymore because it just goes back to the same problem a few hours later. Is there any way we could make it so this cannot happen as much? It's starting to get really annoying. I have no clue how to use HttpService for doing this, so that's out of the image. The only language I know how to code in is lua.

Here's my current code for when the player joins and leaves:

local DataStore = game:GetService("DataStoreService"):GetDataStore("Cities1.111")
local Albany = DataStore:GetAsync("Albany")

if Albany == nil or type(Albany) == "string" then
	print"updated datastore"
	DataStore:UpdateAsync("Albany", function(oldValue)
	local newValue = 0
	return newValue
	end)
end


game.Players.PlayerAdded:connect(function(player)
	
	
	local success, message = pcall(function()
		DataStore:IncrementAsync("Albany", 1)
	end)
	if not success then
		 print("An error occurred: " .. message)
	end
end)


game.Players.PlayerRemoving:connect(function(oldValue)
	local success, message = pcall(function()
		DataStore:IncrementAsync("Albany", -1)
	end)
	if not success then
		 print("An error occurred: " .. message)
	end
end)


game.OnClose = function()
	wait(5)
end