Why do people even invest when they can't hold for more than a week it's just beyond me. If your friend gets upset by few hundred dollars worth of fluctuations what would happen to him if he bought it at 20k and watched it drop to 5k? He would probably die or something. People are predicting the rise of BTC to 100k and your friend is thinking about selling after such small increase in value..
Just tell him to sell everything and go buy some flowers or something, this ain't for everybody.