This is extremely difficult to do, as a lot of people especially these new people who are coming into the Bitcoin market, their emotions sometimes are sensitive or difficult to manage.
Most newbies can relate to this. But if you just manage and train your emotion, you will become stronger and I agree with you OP, holding is better sometimes and it's already proven over time.
But for some people who have goal just to make profits, hodling is not form them as they tend to sell once they already met their price target or goal.