You might want to focus on doing something specific in your dream world. Let’s say it’s rapping. But you haven’t got a respectable body of work that attracts potential collaborators.
So instead of being able to focus all your time and energy on rapping, you need to do all this other stuff.
You need to make your own beats, or if not, at least make the money for buying beats off other producers. You need to record and mix and master the audio. You need to market yourself. You need to manage your own schedule and book your own shows. By yourself, you need to do everything an entire team would tackle for a professional.
This doesn’t mean you should put so much energy into marketing and production that you detract from your main thing. Which in this case is rapping. But to position your rapping into the right spotlight, you need to acquire and execute just enough competence on the other things — production, marketing, management, etc — so that your main craft gets the right presentation.
This is very difficult because sometimes you want to go balls to the walls on the rapping. But all this stuff is getting in the way. And other times you get stuck with the auxillary work so much that you don’t hone your main craft.
But once you’ve presented your main craft in the right way — a way that honestly represents your inner style/voice but lacks that technical or professional polish — then you’ll be setup to attract the potential collaborators. The people who’s main craft is to do the other things that are auxillary to you. You’ll find a producer and engineer who jives with your rapping. You’ll find a marketer who believes in your music. And that’s when a team forms. And that’s when you slowly get to earn your privilege of focusing more and more on your main craft. That’s when you get to make the craft your main one.