We should embrace "missing out and selling at a loss"
Why?
The reason for "missing out" is that we are waiting for opportunities that fit our system and the right buying point. If you wait according to discipline, this is not missing out;
The reason for "selling at a loss" is that we pocket profits in time instead of riding a roller coaster repeatedly. This is not selling at a loss.
"Selling at a loss" is the beginning of stable profits.