I feel lost. How do you find what you want to do?

I'm 24, feeling totally lost and genuinely have no idea where I want to go in life, career-wise. I dropped out of college after getting quite depressed (and because I felt like I was wasting time, money, and effort by studying something I did not want to pursue long-term). I've been working jobs in the animal care industry because I enjoy being around animals, but man, emotionally, it is not sustainable for me as a career. I've used a couple of those online assessments that highlight certain qualities to help you look for jobs, but I feel stuck after getting those results. I would love to just try a bunch of different roles, but I need to work full-time to meet my needs. How do you find something that you might enjoy enough to keep doing for the rest of your life? I'm willing to go back to school at this point, but I don't even know what I would study..