of course I still believe in altcoins many altcoins have good potential there are even some altcoins capable of rising so high it all depends on the owner if the owner keeps trying to develop the project, I'm sure altcoins will have a high price
That include the popular coins.
Even the market turns bearish they can survive.
Thats why it is worth the time if you hold such coins.
Choose a good coin to invest because investing in alts are still profitable.