Continuing education without taking out loans?

I've been making a living as a freelance artist, but I've been kind of stuck on a treadmill doing the same work and not really advancing either professionally or monetarily. Many higher-paying gigs require certification or degrees in a certain field, and the nature of the business is changing with newer technology and applications. I'd like to go back to school to update my skills, and was accepted into a highly reputable school with a high placement rate, but unfortunately I cannot afford the tuition on my own; cannot afford to take a break from work due to living expenses (I don't have much in savings) and found I am ineligible for federal grants because I "made too much", even though a large chunk of what I make goes into paying self employment taxes, work-related expenses and health insurance costs. I don't have family I could stay with and am living entirely on my own. I would need to have some extra money not only to afford tuition, but to be able to afford living expenses while focusing on school. Is there any solution to this situation? I'm tired of being stuck on the treadmill but I don't really want to go into more debt by taking out loans.