I advise you to buy altcoins that have been proven and real progress, which they certainly have teams that are constantly trying to develop their altcoins.
I think NEO and ETH are the best altcoins currently.
At present ethereum prices are very falling and a good opportunity to buy them because ethereum still has the potential to revive from the weak crypto market. NEO is indeed worthy to hold because it is an altcoin that is good and has the potential to grow like ethereum.