gui only cloning once when it can clone multiple times?

alright so in my game this is my levelup handler which when someone levels up it is supposed to clone a gui into their PlayerGui which it does fine the first time but after they level up again nothing, i have no idea why it would just quit after one clone

script:

game.Players.PlayerAdded:Connect(function(player)
    local requirements = player:WaitForChild("Requirements")
    local levelrequirement = requirements.RequiredKills
    local leaderstats = player.leaderstats
    local kills = leaderstats.Kills
    local level = leaderstats.Level
    local levelupgui = game.ServerStorage.LevelUp:Clone()
    kills.Changed:Connect(function()
        if kills.Value >= levelrequirement.Value then
            print(player.Name.." Leveled Up")
            level.Value = level.Value + 1
            levelupgui.Parent = player.PlayerGui
            wait(5)
            levelupgui:Destroy()
            if level.Value >= 5 then
            levelrequirement.Value = levelrequirement.Value + 20
            else
            levelrequirement.Value = levelrequirement.Value + 15    
            end
        end
    end)
end)