Gotta either cut costs or increase pay. When I was living on $600 a month I roommated up, I applied for food assistance (SNAP), I bought a shitty craigslist car rather than picking up a car note, and I stuck to cheap cell carriers.
The last one is a place a lot of people could save a few dollars. T-mobile has a plan called t-mobile connect that is $15 a month with a few gigs of data. Works fine. Actually still use it now that I have a better job.
Ultimately you need to make more though. Think about all the skills you’ve gained in food service and retail and apply for another job you think you’d be good at. Imo anyone can do low level office work, for example. Sounds like you’re in the US, so keep an eye on Craigslist and Idealist.org (two engines where the jobs available are usually actually available unlike most search engines). Make it a habit of scrolling through and forming an opinion about what you would/wouldn’t like. Make a resume to fit (use chat gpt to help). Lie about things you’re pretty sure you could handle no problem but have no experience with. Once you get a better job do the whole thing again with the new experience to pad your resume.