Hi! Im actually holding a lot of alts. Im absolutely over diversified but i dont know what to sell.
I'm very scared to sell some of my coins and see a time later that the price skyrockets. I know that I have too many coins but I really do not know what to do.
Any advice or suggestion?

You weren't playing around by saying that you are over diversified. I hope that you don't keep those coins on an exchange because they can do whatever they want with that money.