Can anyone figure out why my save/load script won't work?

Can anyone figure out why my save/load script won't work? I've tested it many times and can't figure out why it doesn't save...

game.Players.PlayerAdded:connect(function(plr)
	local key = "user_"..plr.userId
	plr1 = plr
	data_points:UpdateAsync(key, function(oldValue)
		local newValue = oldValue or 0
		repeat
			wait()
			plr:FindFirstChild("Points")
		until plr:FindFirstChild("Points")== true
		plr.Points.Value = newValue
		print"POINTS LOADED!"
		--return newValue
	end)
	
	data_wins:UpdateAsync(key, function(oldValue1)
		local newValue1 = oldValue1 or 0
		repeat
			wait()
			plr:FindFirstChild("Wins")
		until plr:FindFirstChild("Wins")== true
		plr.Wins.Value = newValue1
		print"WINS LOADED!"
		--return newValue1
	end)
	
	while true do
		wait(5)
		data_points:SetAsync("Points", plr.Points.Value)
		data_wins:SetAsync("Wins", plr.Wins.Value)
		print'saved!'
	end
end)

Thisloop - it looks like you're trying to wait for a child named "Points" to be added. However, it will never escape the loop since it keeps trying to compare the object to true, which will always be false.

repeat
	wait()
	plr:FindFirstChild("Points")
until plr:FindFirstChild("Points")== true

UpdateAsync is supposed to be used when you're trying to update the value. In your case, you just need to get the value, so you should be using GetAsync.

game.Players.PlayerAdded:connect(function(plr)
    local key = "user_"..plr.userId
    plr1 = plr
    local points = data_points:GetAsync(key) or 0
    plr:WaitForChild("Points")
    plr.Points.Value = points
    print("Points loaded")

This code is really inefficient, and it may cause you to run into the DataStore request limit. Instead of setting it every 5 seconds, you should probably only update it when the player leaves (use the PlayerRemoving event)

    while true do
        wait(5)
        data_points:SetAsync("Points", plr.Points.Value)
        data_wins:SetAsync("Wins", plr.Wins.Value)
        print'saved!'
    end