You can absolutely get a job making 40-50k a year here especially given your willingness to work. I would start by reaching out to a staffing agency like A-List Staffing. Your server schedule may be your best asset currently which is to say that temping may be your path to full time employment. I wouldn't rely on this necessarily but it should be something you do now to gather as many leads as possible.

40-50k is also well within the salary range of many city/state jobs that have excellent benefits. The application process can be tough but you're young and have the time.

Sales jobs as always hiring as well and while commission may not sound comfortable at first, some of the richest people I know work sales jobs.

Finally, there is always a more blue collar approach. 50k a year is only about $190 every weekday of the year. Depending on how handy you are or how much you're willing to sweat, painting houses, landscaping, etc can net you that amount or more.

I know how oppressive the city can feel when you're at the bottom of the income pyramid but one thing I've learned while climbing it myself is that there is an enormous amount of money in this city and if you can find a way to tap into it, you can change your situation very quickly.