Losing money in a bull market, the biggest reason is: too anxious, too restless
The logic of a bull market is completely different from that of a bear market; in a bear market, there are only a few good assets, so you need to look more, find various information, and identify the true alpha from it;
The biggest problem in a bull market is that all coins are rising; today this one goes up, buy it; tomorrow that one goes up, switch to that; in the end, you end up with nothing.