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)