I believe that anybody interested in Bitcoin has done some background check because all this fluctuation didn't start after the day he bought Bitcoin that is how the market works and his purchasing the coin won't stop that dimension, whatsoever decision your friend takes my point is just that he should try not to sell below the procuring price.
The bear market is the best time for us to hold Bitcoin since we should always buy when the market is down and sell when the price is going up. Bitcoin is a volatile coins and we need to understand that holding Bitcoin can either make us lose or gain if we sell immediately when the market is going up or down. The wise traders always buy at the market floor and sell and the market top. Those that are traders know about this and they always act on it to earn more from the market. As an investor, we should always try our best to understand the market as an investor so we can benefit more from the market.
When the market goes down, those who bought bitcoins at high prices start panic selling and those who don't have bitcoins start panic buying. and thus those who make decisions in panic face losses. because when one is in a state of panic, one's higher consciousness does not function. And he doesn't care about the effect of his decision then. but if he can take the right decision at the right time, it is possible for him to do something good