When you really need money, then yes, you have to sell despite the expected growth. In some cases, you expect growth, but in the end you lose everything.
Professional investors have time. They do not need to sell their assets at the wrong time. If a private investor was forced to sell assets for a non-market reason, then he should not have invested.
Sometimes investors have to sell the coin at a loss when they realize that there will be no further growth and now there is a rapid price reduction. In order to at least return part of the deposit, the investor sells the coin at a loss. But this does not mean that he is a bad investor.