It's hard to predict which out of thousands of alts will go up, but what you can predict is that once a coin went up, it's bound to go down. Like, take the best performing coin right now, Dogecoin, there's absolutely no justification for its price, it has no adoption or promising features, it's pure hype. It's bound to go down, so if you carefully short it with small leverage, you're going to make profit. Obviously, the danger is in the known trading wisdom - "the market can stay irrational longer than you can remain solvent", but still the fact that pumped coins will go down is something that you can rely on.
Honestly, I don't understand why people flock to buy the Dogecoin, a meme coin with no trends, no utility. As it has been exaggerated in the community, including celebrities. They make money and they understand, but others don't. It is this that has caused great damage to the market, that even those people will be left out, inexcusable!
Thousands of alts, but it includes tons of shitcoins. It will destroy you if many people do not realize. Or they are just puppets, blind.