Need help ASAP script won't work/glitching why? (Read desc)

I tried making this script myself but, it won't work I was trying to do is a player can't spam the teleport back to the island. But, sadly I failed. So, here's the script if anyone could help me that'd be wonderful! :)

local db = true
local player = game.Players.LocalPlayer
local target = game.Workspace.TeleportPart
local delay = 3
script.Parent.MouseButton1Click:connect(function()
	if db == true then
		db = false
		player.Character.HumanoidRootPart.CFrame = target.CFrame * CFrame.new(0, 3, 0)
		for i = delay, 1, -1 do
			script.Parent.Text = i
			wait(4)
		end
		script.Parent.Text = "Teleport to Red Brick"
		db = true
	end
end)
local cooldown = 0.25