There is a saying in The Ghost of Wall Street:
Before the market proves itself right, assume that it is wrong.
Lower your expectations and think more about what to do if it does not meet your expectations? Avoid losing money in a fit of the mind.
Sun Tzu's Art of War says: Before thinking about victory, think about defeat first. It is the same principle.
We do what we can do well. How much we can earn depends on whether the market gives us meat to eat.