My trick is in understanding two things:
1. Such a drop in the price is normal after such rapid growth as in December.
2. After the price falls (however long it will last), its growth will occur.

Also, some actions help me. I look at the price for bitcoin only once every 2-3 days, and for other currencies once a month. This helps me get rid of unnecessary worries about the price fluctuation. Also I began to read less crypto currency news.

As a result of all this, I don't think about crypto currencies 24 hours a day. And when I see that the price has once again lowered, then I'm not nervous, because I know for sure that this is temporary.