The quality of your decisions depends materially on the mindset you are in. Julia Galef shares, that following a Scout mindset can materially improve the way you take decisions: Being curious, open and grounded can significantly improve your judgment skills.
Practically, this translates into programming yourself to feel proud instead of ashamed when you learn you were wrong about something. Or to feel intrigued rather than defensive ,when you discover something that contradicts your believes. Ultimately, it is all about a state of mind, aiming to see the world as clearly as one possibly can.