I guess it really depends on the altcoin that we're going for, Bitcoin is really hard to beat and it will remain as King, if not forever. Though there are quality coins that will be huge because of cases with them having real partnerships (not just verbal) and making efforts to get listed in top exchanges like Binance for more volume. I invested in one altcoin way back 2017 and I haven't seen so many efforts, marketing, or constant updates to the community at all. Those are the altcoins that you may need to stop following.