I am cautious when it comes to self-help advice. This is because when people ask me for self-help sort of advice they are generally asking for advice about how to achieve external goals, like make more money, become more influential, etc. The problem is that working on these sort of goals is not actually the most important work.
In the Broadest sense, there are two kinds of people, or perhaps better, two “ways of being”. Competitive or cooperative.