Such altcoin assets are very risky for trading or holding. Although we can see some people making huge profits from altcoins that pump quite high, this does not happen with every asset. Some traders get too panicked when they see trends like that, and what happens is they buy during the pump and then can sell at a loss shortly after. Trading requires experience, especially when determining which assets to buy.
Altcoins aren't always a good option for trading because they aren't easy to understand their market. Their market don't have a long history to look at to be able to understand what might happen next. Altcoins are bought and sold more with emotions and this causes the pump and dump that we see in the market regularly. Buying altcoins can make you big gains in the future if the altcoins you bought gain attention but in a situation that it doesn't get noticed, you'll be left hodling an altcoins that's decreasing in price very fast. Buying at the top at times doesn't mean you aren't a good trader, you're a human being and mistakes happens to everyone.