I think the best coin to HODL is still bitcoin ,65% of my money are in bitcoin and the rest on altcoins like ETH and LTC ,gone are the days when you will see 2000% of altcoins, bullrun has been around for months now and altcoins aren't favouring that much,they will be profitable but not just like 2017 pump
As for me, it is bitcoin and eth. I am seeing good returns on these two top cryptocurrencies. As to other alts, I think one can still pick at least five that has the best potential to grow when bitcoin can be making the next move towards the $10K level. Putting more than 50% of one's crypto holdings on bitcoin can be a wise decision.