There's a world of difference between hobby and livelihood. "Hunger" (literally and metaphorically) drives the latter and mobilises everything you can possibly bring to bear in your work, including, among other things: practically endless courage, care and fortitude; all of your mental faculties and their constant 'sharpening'; the drive, energy and acuity to work ever more efficiently and effectively; harnessing your utmost stamina; embracing and utilising fear and other negative emotions; avoiding undue influences of momentary thrills and satisfactions; and the never-ending quest to "amplify" the actual returns you get from your work.
Hence it's very probably futile to expect your hobby to somehow morph into your livelihood of its own accord. Either you make the transition as a deliberate and major upheaval in your life, or it just ain't gonna happen.
For the longest time in human history, one could not afford not to be completely and utterly serious about one's livelihood. Nowadays of course there is the safety net of "welfare" provided by the state; nevertheless, top professionals somehow manage to nullify the potentially debilitating influences of that factor's existence.
And what if the work itself involves creativity, such as in any of the fine arts? Can it be taught? Some of the craft can be taught but art cannot be taught. The best one can hope for from any formal educational setup is that it may facilitate one's own learning how to learn; but in the worst cases one may perhaps be able to unlearn the nonsense formally taught that tends to obstruct one's art, even though this may involve many years of arduous effort after one's formal eduction is concluded.
I'm retired now. My professional career was not in the fine arts although it certainly involved creativity, albeit in corporate world. These days I'm an observer of the professional music composition scene and find it fascinating for many reasons. Someone who shares many of the opinions I've outlined above is media composer and educator Guy Michelmore. I heartily recommend his video on this topic:
The Three Things I wish I knew when I started writing music
(I'm in no way affiliated with Guy or ThinkSpace Education.)