There’s nothing new to this practice, of course. The markings are called marginalia, and readers have probably been doing it as long as we’ve had books.
Finding purpose isn’t a mission, it’s an experiment. It’s impossible to know what you’re meant to do by way of introspection. You have to actually try things.
If you’ve found your art/craft/vocation, there’s nothing wrong with working your way to mastery, as long as you keep having fun. Don’t let the allure of success take all of th…