Ethereum always for the number 1 altcoin. Next is Litecoin and the others, I think the popular utility coins of exchanges but I barely hold them because I've sold them all.
I think you should consider Binance(BNB) for Holding and some Ripple as well .
BNB, I have it before but I've sold it as said but I have a plan to get again in the future but not of priority now.
XRP? nope, I will not.