It's better not to give advice to this kind of problem because in the end when our advice is contrary to what happened we are the one to blame. Just say to your friend that it is up to him to decide whether to hold or sell his crypto.
I really agree with you, because here about trading someone's luck, because when we give advice to hold it, then in between other times he really needs money suddenly and the market price at that time is also low, that's when you will lose. trust your friends
And if the friend follows your advice and goes sideways, that would be a problem. Better tell him to follow his instincts, because the market is very volatile, it is quite a challenge to give an accurate advice. Let him decide on his own about what to do with his funds, at least, whatever happens afterwards, he can't blame you. Even if he is a friend, it is still not good to give him advice in this type of market.