By training yourself mentally in this, it is possible to change your life so that you always and only do things you know to be worthwhile. Anything that you discover that gives you satisfaction and helps you feel good, is worth to be considered to be tried out for deliberate repetition and worth to be tested out for possible addition into your bag of 'good tricks'. Feeling better helps you to live and perform more effectively. Do the things that give you satisfaction. The things that give long-term satisfaction are the things that are most useful to you, and the things that are truly most useful to you are the things that give you the most satisfaction.
Real satisfaction comes from successful building at one's own strength.
One thing that is among the things that gives most satisfaction is to be your own boss, and to be in control of things. Servants and those who let themselves lead by other things are wretched, unhappy people who don't accomplish anything and are sinking ever deeper into the morass. Don't allow yourself to be caught in the morass. Doing the same tedious thing over and over again is never good. One who has stuck in a rut always will get overtaken and outperformed by the hostile world, and probably is already being taken advantage of by someone or something.