in trading there's a type of strategy that we called shorting and it's goof for such situation (bear market),But it required skills coz you will trade with leverage and its very risky, that you must have risk management in order to prevent massive losses.
Shorting means selling at the current running price and then buying back at a lower price, here it is actually same as buy low sell high just the order is reversed. Shorting needs to be correctly timed otherwise if the market turns around in the middle of the two trades, you will end up in a loss and a bad position.
However if you don't have such skills, then better to wait for the right time to buy at the dip to prevent risky situation coz even you trade top coins but you don't know how to shorting for sure it will be a nightmare afterwards.. So better to wait and be patient until the market turns into bullish again.
It is more of timing than skills. Shorting should ideally be done right at the beginning of the bear crash. Most traders miss this point and usually get alerted by the time a few hours have passed. Because the effect of a large market movement is rapid in this market, therefore shorting becomes even more risky.
Either way with a calm mindset, it can be made to profit.