There have some altcoin who have really good future for a long run investment.
1. Crypterium -CRPT
2. Tierion - TNT
3. OX -ZRX
4. Crypto.com - MCO
5. solve.net - SOLVE
What do you think about them? Also do you have any other recommendation for a long term investment?
All these coins you mentioned are at the highest price as I can see.
I can't say about solve but others are high enough to stay and follow btc bullrun if that happens.
There are a lot of new projects out there which their market cap is not what it's supposed to be yet. You can buy and keep these coins for future or longterm investment