I Can't Get My level Up System To Work?

So this script is suppose to level you up, but when your xp reaches 700 (when your level should increase) your level does not go up to level 2

local level = game:GetService("DataStoreService"):GetDataStore("Levels")
local xp = game:GetService("DataStoreService"):GetDataStore("XP")
local axp = game:GetService("DataStoreService"):GetDataStore("AXP") --Stands for ammount of xp needed to level up!

function savedata(dataname, playerid, value)
	game:GetService("DataStoreService"):GetDataStore(dataname):SetAsync(playerid, value)
end

game.Players.PlayerAdded:Connect(function(player)
	local leader = Instance.new("Folder")
	leader.Name = "leaderstats"
	leader.Parent = player
	local levelz = Instance.new("IntValue")
	levelz.Value = level:GetAsync(tostring(player.userId)) or 1
	levelz.Name = "level"
	levelz.Parent = player:WaitForChild("leaderstats")
	local xpz = Instance.new("NumberValue")
	xpz.Value = xp:GetAsync(tostring(player.userId))
	xpz.Name = "XP"
	xpz.Parent = player
	local xpn = Instance.new("IntValue")
	xpn.Value = axp:GetAsync(tostring(player.UserId)) or 700
	xpn.Name = "XpNeeded"
	xpn.Parent = player
	
	xpz.Changed:Connect(function()
		if player:WaitForChild("XP").Value >= player:WaitForChild("XpNeeded").Value then
			levelz.Value = levelz.Value+1
			player:WaitForChild("XP").Value = 0
			xpn.Value = xpn.Value+700
			savedata("levels",player.userId,levelz.Value)
			savedata("XP",player.userId,xpz.Value)
			savedata("AXP",player.userId,xpn.Value)
		else
			savedata("levels",player.userId,levelz.Value)
			savedata("XP",player.userId,xpz.Value)
			savedata("AXP",player.userId,xpn.Value)
		end
		savedata("levels",player.userId,levelz.Value)
		savedata("XP",player.userId,xpz.Value)
		savedata("AXP",player.userId,xpn.Value)
	end)
end)

game.Players.PlayerRemoving:Connect(function(player)
	savedata("levels",player.userId,player.leaderstats.Level.Value)
	savedata("XP",player.userId,player.XP.Value)
	savedata("AXP",player.userId,player.XpNeeded.Value)
end)