Do you think is is a well diversified portfolio or are there any coins in it that should be dropped and substituted.
Since all the options that you are giving are assets that are part of this market then I would say that your portfolio is not diversified at all, it seems that all your money has been invested in this market and as we know a great deal of coins move in very similar ways, so I doubt that you have truly achieved your goal of a diversified portfolio.
But if that is the case then how to achieve it? By investing money in other markets as well, like stocks or real state, so in the case one market performs poorly the rest of the markets can offset that loss.
Since this is a crypto-only forum, the OP just wanted to ask how to diversify investments in crypto without mentioning other assets. But in OP's portfolio, I see no mention of bitcoin. Is that a big omission?. I think OP is a crypto investor then OP's portfolio must have and must have bitcoin in it, all altcoins OP has given none is better than bitcoin and more secure than bitcoin.