SOL
ALU
DDN
ALU
DDN
It is ok to put Sol among the three coins of your choice, as these coins have potential and are in demand in the market. But you have to think about the other two projects, because so far those projects have not been listed on the top exchange. So when it comes to investing, you have to consider everything, if you are aware of the advance update when it can be listed in the top exchange, it can be an important aspect.
however, if you want to hold a coin long term, one of the parameters is to see where the coin is listed. maybe gate.io can be a consideration if there are some other exchanges there. however, there is no popular market like binance or kucoin. Well, maybe there is a percentage that can list in one of those markets, but that seems quite difficult. better include BNB in your portfolio, or ETH. I might choose BNB and ETH over the two coins.