I found the easiest way to find recruiters was to simply do a google search for local recruiters. They often will pop up. They also post a lot of jobs on LinkedIn and Indeed, a good agency that I believe is all across the country is Robert Half. I think Parker Lynch might be another one. But I personally have found the local small recruiting agencies to be the best, but there's nothing wrong with the two I mentioned. Go on their website, find a phone number, call, and just say you're looking. Connect with them on LinkedIn, don't be afraid to follow up, they're used to it, they can be a great resource.
Luckily I wasn't homeless long. I was homeless while I was at a tax intern at a regional firm. They made the internship promising, made it seem like they'd turn it into more, then none of us tax interns were hired, they basically just wanted cheap labor during tax season and encouraged their employees to talk to us as if we'd get jobs to motivate us to work harder to try and “prove” we'd be a good hire, even though they knew they were going to hire none of us. This is one of those regional firms that advertise they care a bunch, but clearly they don't. I've learned that the companies that spend the most time advertising about how caring and good they are, usually are the least caring ones. But while I was homeless, I just kept working hard. Luckily right when I moved to that city I met this beautiful lady who I fell in love with instantly, and despite my career struggles she saw something in me, and eventually we got married. But at the time we were dating and she was in an apt with roommates, so I just slept in my car and they agreed to let me use their shower if I reimburse them for the water cost. So it wasn't too bad, thought it was a sketch ghetto area and that particular apt complex had some murders, so it wasn't the most comforting thing to sleep in my car, but it was only for a week and it wasn't too bad. Plus most of my stuff was with my parents in my hometown.
But I just fought through it all, and I'm so glad I did. I had those same thoughts, to just say screw it and give up, and heck, I even had family members tell me to screw it and give up, but I didn't, and now I'm at a firm I love in my small hometown with partners that love me, I get paid well, just bought my first house with my wife, and passed three sections of the CPA exam. Adversity sucks, and it's unfair that some of us have to go through the crappy jerk employers, and some people get lucky and don't have to pay anything for college, can sit pretty at home, and use their parents for referrals to get a job at a big firm, but I'm glad I went through the path I have, because it has created a lot of character and empathy others don't have. I hope someday to start an accounting recruiting agency for people that graduated but can't seem to find a firm that will hire them, just like me, because there is a lot of great talent out there who share these struggles, but the darn firms, especially the big ones, REFUSE to consider them.