Techie people on the Internet have opinions on how YOU should live your life! “Here, take my advice; I wasn’t using it.” Well I will take you up on that, stranger:
(1) Focus on High-leverage Activities — “Leverage should be the central, guiding metric that helps you determine where to focus your time.” (related: Eisenhower decision matrix — “what is important is seldom urgent, and what is urgent is seldom important.”, “The best time to plant a tree was 20 years ago. The second best time is now.”
Gabriel Weinberg’s blog has more mental models-.