Ugh! Debounce problems AGAIN! Is this code fixable?

Debounces are used to regulate how many times an event can be fired. In your code you are currently not regulating anything, you're just changing a variable.

I modified your script, added comments around the debounce area so you can read those if you want a better understanding of what I changed.

local debounce = false

script.Parent.Touched:Connect(function(hit)
    if debounce == true then return end --//If debounce is true, then return nil
    debounce = true --//Turn the debounce to true to make sure it doesn't fire the event again during the execution of the code below

    local player = game.Players:GetPlayerFromCharacter(hit.Parent)
    local lvl = player.leaderstats.Door1
    if player and lvl.Value > 1 and not player.PlayerGui:FindFirstChild('buydoor') then
        script.Parent.CanCollide = false
    else
        local cloneui = script.buydoor:Clone()
        cloneui.Parent = player.PlayerGui
        cloneui.Frame:TweenPosition(UDim2.new(0.25,0,0.2,0))
    end

    debounce = false --//We have to put this at the end to make sure the debounce becomes false again and the event is activated once more
end)

you didnt add the if statement for the debounce you just had a variable named debounce laying around doing nothing and your just setting it to true and false

From what I've been told, you shouldn't do that. This is what I was told to do:

if not debounce then 
    debounce = true

-- or this:

if debounce = false then
    debounce == true