What qualities need to be cultivated in yourself in order to increase psychological balance?

The ability to soberly assess their capabilities, desires, potential and the situation as a whole. And also the ability to adequately weigh the pros and cons, calmness and ability to control oneself.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.