Never have an obsession.

Use your own strengths and thinking to earn money, and strive for excellence in that area. Do not venture into fields where you are not skilled.

For example, in contracts, I basically lose money overall, and I envy others who make millions on a single trade. But I've been playing for a long time and have been losing money overall. I used to always think about making back the losses, but in the end, I just decided not to touch it. It's too difficult to control in this market. If you can't control it, give yourself a cooling-off period.
Of course, there are also contracts that make big money; I'm just talking about personal operations.