A bull market, simply put, is when the overall trend is continuously upward, and the increases happen very quickly. This results in significant volatility. Altcoins typically fluctuate around 10%, which is already considered a lot; now that the bull market has arrived, fluctuations of 15%-20% are not surprising at all.
Currently, altcoins have broken below support levels and are starting to enter areas that no one is monitoring. High market cap coins may experience a correction of 75%, while low market cap ones might even go back to their starting points. But don't think that the bull market is over just because there's a drop; that could lead to significant losses. Remember, in a bull market, going long means that even if you get stuck, there's still a chance to break free; but if you go short and get trapped, just wait for liquidation.