For long-term investment, I think these coins are well suited , and so I would have added xlm tron ada
Tron and Ada are a good one but i'm not sure with XLM. My recommendation is buy altcoins like ethereum, bitcoin cash and Litecoin. Just buy on top 10 altcoins, it's more safety imo.
The current market condition is good right now, so buy it now before you too late because i think it will increase again.