This was the highlight for me: "Perhaps the most useful way to figure out what you really want to do is to observe what you actually choose to do." In other words, what do you do in your free time?
To make 'free time' work economically viable. You have to do it full time. And to win doing it full time, you will have to work crazy hours. At that stage it no longer remains enjoyable.
People enjoy the 'free time' work because it comes with some mental perks. No fear or losing something on failure. Risks are cheap, having options to always drop it and do something else. None of that is possible if 'free time' work becomes full time work.