I will say it all depends on the situation of the market and the mindset of the person. Cause no one will desire to sell when the market is not favourable. It is a well saying that every businessperson or investor who has invested or started a business in the crypto industry will want to take out or keep the profits made, and secure more profit in the future, with the desire of having little to no loss expectations, knowing very well that loses are inevitable in every business.
Holding Bitcoin and ETH for the long run is the most promising path, while using some other coins for trading, making out gains/losses from the market, which is not touching or affecting the major assets.