For altcoins, buy low and sell high, and you will make a profit. Although this statement is correct, it does not go for all coins. Some people think that when the market rebounds, their altcoins will rise with it. But the result was leaving the market at a loss.
So choose wisely and follow up the project. See what their developers are doing, or just hiding behind the prevailing saying.
I probably agree with you, because as the practice of the last few years shows, not all altcoins were able to reach their new ATHs or show great growth. I believe that this is due to the large number of altcoins on the market, which leads to a lot of competition, and as you know, in such a struggle, the hardest survive, and the weak leave the market. But in order to be the holder of the best altcoins, you need to turn to at least the top 100 altins, for example, on Coinmarketcap and analyze their price movement and development. Perhaps this will allow you to choose the best and invest in them.