this often happens to a beginner who wants to get a bigger profit, thus making them wait too long and when the token or coin they are waiting for drops from the market price they usually sell it out of panic or sometimes because of a sudden need for living expenses. but when someone is an expert then they will wait how far the altcoin will come back and of course seen from the potential of the altcoin whether it will be long-term or short-term to be used as an investment.