The reason why bull markets are easier to trade than bear markets is that during a bull market, Bitcoin keeps rising, and there will always be buyers for other altcoins. Therefore, as long as there is logic, other people will buy, and prices will go up. In a bear market, Bitcoin keeps falling, so no one buys altcoins. The overall market is declining, and people are even less likely to buy altcoins, so when no one is buying, it becomes difficult to trade.