Do you think is is a well diversified portfolio or are there any coins in it that should be dropped and substituted.
All the options you've provided I think the potential is already very good, even if it doesn't need to be replaced anymore. I also if investing in all the coins will not sell them in a short time, I'm better off mining other coins, without having to replace what I invested. All the coins on your list are some of my favorite coins like ethereum and solana, and they are all just as good.
In addition, instead of me replacing them I will supplement them with small investments like BNB tokens or Solana tokens.