Just as everyone I think it depend on the time they bought it. Everybody cannot be in red at the same time , although there is always a regret in crypto but it depend on when you buy it.
You can handle green days, but when red days come, you keep complaining. Well, if you can't handle the situation, sell it. There are red days in bitcoin every year, and if you are new to the cryptocurrency, I'm sure you're scared now, but if you know and trust it well, bitcoin will bring you to the moon. Try to handle or practice your emotions in this kind of situation. Others also said try to handle your investment, like selling it while it is green, then waiting for bear days only if you are not that greedy on green days.