One of the most common errors traders make while dealing with cryptos is the fear of missing out (FOMO) and FUD. These two variables lead them, out of fallings, uncertainly excitement and doubt, to take decisions.
Another common factor which causes traders to take wrong positions is impatience. Every other minute, traders keep checking the prices and end up making wrong decisions.
Not diversifying is another mistake that is common. People spend all their money on a single coin, so when prices fall, they lose big. Investing in more than one coin, which means diversifying, is a better alternative here.
In addition to these other mistakes, the pump and dump scheme, revenge trading, reluctance to thoroughly study the situation, blindly following the crowd etc.