Focus on what you have now to be more rational.

Know your options before you act.
As Blaise Pascal put it: “All of humanity’s problems stem from man’s inability to sit quietly in a room alone.”

Ask friends to tell you the truth.
Ask them to be absolutely honest with you.

Avoid negative things you cannot be accustomed to.
For example, commuting, noise, or chronic stress.

Expect only short-term happiness from material things.
Examples of these include cars, houses, etc.

Focus on what you do.
Sustained positive effects typically result from your active behavior.