Many people sell because they are ready to release it and they are also ready to make a profit. Because not all altcoins can live long like humans. They sell altcoins, they also have various reasons for each, especially those who fear that the altcoins they hold the price fall on the market. The best strategy in my opinion is, you just sell some of the existing altcoins, and sell some of the altcoins that you hold when the price is really high. Don't sell the altcoins that you hold this all when the price is like this.