During the bear market, most coins fall very low, even lower than expected. But if you are able to hold your coin during their time, you can sustain all the hurt that comes with crypto when price falls.
If you see that your coin falls in price and the fall will continue further, then it makes sense to sell it and then buy at a cheaper price. Thus, you will have on your hands the same amount of coins, as well as profit from the difference in the price of sale and purchase.