10 years ago I made the decision to be "professional" and live off my art. But to do that, one has to treat their art as a business. That means:
1/3 of your time is spent traveling to exhibitions, performances, workshops, classes, festivals, symposiums and any other place where you get to show your stuff or do your thing...
...and 1/3 of your time is spent doing networking, promotion, organization, documentation, administration, applications, bookkeeping and all the other boring shit that happens when you sit down behind a computer (unless you are successful enough to afford an agent who can do it all for you)...
...leaving 1/3 of your time for the rest of your life.
If you don't have a family or a social life, you might actually be able to make art with that time. Or you could try giving up sleeping. In the end, you have to decide whether having a day job would give you more or less creative time and mental space, and then take it from there.
Best, Derek