After my 2 years in the cryptocurrency space, after all the panics at the beginning(first few months) of my investment journey, you simply kinda just get used to it. A huge factor is also that even though I invested a significant amount, if ever my crypto investments go to zero(even if it's kinda almost impossible), I would still have a place to live in and have enough money for food and to start over.
A bull market right now would be really nice, though..
I agree with your statement that one key to being able to "stomach" the low drops in the market is to be comfortable with the amount of money that we have invested in. Losing time and energy is not as bad as losing a significant amount of money. We have to invest with the mentality that we will be okay still if we lose X amount of money.