There are no as such rules in the crypto trading but when it comes to the bull and bear then people do get very obnoxious about the whole situation and the money that they have invested in it.
I have simple tricks on my mind. Whenever I am putting my money in the crypto trades then I keep my Break Even Point at multiple points by buying three to four times at different prices. As soon as these points are covered by the bull then I keep getting some profit and thus securing my invested money. Now you use bear to enter the market and in the same way, bull can give back more. You dont have to worry about it, you have to make opportunity out of it.