I only believe in the top 10 altcoins - they are more reliable. The rest of the altcoins cause me doubts and I think that in the future they may well disappear, although it is possible that new coins may appear that will replenish the list of top ones.
not all altcoins listed above are good and vice versa, useful altcoins are still being managed by the dev and maybe altcoins listed under the project are more interesting than those in the top 10, and it is interesting to follow for future developments.
actually this is a bit ambiguous, because from what I know, although currently the top 10 coins are good coins, but that does not mean coins under the top 10 cannot be top 10 coins. however, there are still quite a lot of good coins to choose from under the top 10 coins. Even monero and steller are not among the top 10 coins for now. so, I think, there are still quite a lot of coins worth considering out there, and altcoin that has a future is a coin that continues to evolve, and blends in with the latest technology, or it can be said that altcoin that will survive is a coin that has benefits and contributions big at the moment.