Find ways to monetize your talents passively such as e-courses, Kindle books, etc. Build up something that you own while you drive and write to pay your bills-- whether it's practical like an e-course, or a creative IP like a game, novel, or totally new form of media that can grow a fanbase.

As someone who does a lot of writing for hire, I'd like to point out that there are TONS of writing opportunities out there- more than you can imagine. There's some great content writing platforms out there which can be better than working with private clients in many cases. (Just please, please tell me you're not spending time looking up writing jobs in the cesspool that rhymes with Dup Jerk...)

My writing income any given month is about $2-3K on the low end but if you get larger projects and negotiate your worth, that can easily become $4-5K or far, far more depending on what your skills are and where you look. Technical writers can earn well into six figures.

Diversify into other areas where you can charge a lot more for less time, like consulting and strategy.

My line's open if you need help figuring out how to get paid more as a writer. I was in a similar place as you at one time: I busted my ass with rhymes-with-ghost-hates until I could get my second biz off the ground. Now making a very comfortable living as a hustler with both active and passive income!