As of this time, I would highly root for Ethereum as the best long-term altcoin to hold because of it’s London hard fork upgrade where it burns $8k every minute that would make the demand go higher in the long term. Although this is just my own prediction, I could say that ETH might reach a minimum of $5k to $6k before the end of the year, but $10,000 per ETH is still possible for me.