Yeah I felt bad for my friend. I was telling him to buy all yeat and then he finally did around 20K... I would've told him not to at that point.
Basically is not your mistake so you never need to feel bad. It is part of every market as no one predict right what is going to happen next. Just ask your friend to continue holding his coins so that he will find price levels to go above $20k like $25k or even $40k then he also will be into profits. but it may need year long waiting too.