I believe you've already made solid choices, and the potential additions you're considering are interesting picks. For the several promising projects you mentioned, I recommend researching their use cases and teams. While it's essential not to go overboard with too many alts, if you genuinely want to expand your list, investigate those with unique features or partnerships. Your inclination towards long-term commitment is evident, indicating that you're not just chasing pumps.
Chasing AVAX solely because of its recent rise might not be the wisest move, but you could consider a DCA strategy. I suggest holding ETH due to its strong fundamentals and potential as a base layer for DeFi and NFTs. Additionally, explore projects building on ETH Layer 2 solutions, such as Polygon and Arbitrum, for DeFi exposure without high gas fees.
Have you also considered tokenized real estate or infrastructure for further diversification?