Actually, I do not understand those guys, who ask what to do - sell or hold. OK if they need some money urgently, they will do it without any advice. If not - they are going to hold their cryptos, I do not doubt it.
Same here, spending all day scratching your head when prices return to atm will not change anything, you just become more emotionally involved while you should you logic and simply buy more if you still believe in the projects you invested.