G. Mark’s Answer
This is an easy one. First, there are tests called "personality inventories", one of which is, for example, RIASEC. Basically they examine your personality, interests and preferences. But they do so in a way not to simply ask you what you like, but to see how closely your personality aligns with folks who are successful in various professions. The results can be surprising, but they have proved very reliable in predicting job satisfaction. I, for example, aligned with what I expected. Scientist, mathematician, engineer. And then I also saw security analyst, entertainer and park ranger. Having tremendous stage fright, this surprised me. Having an interest in lock picking, I assume, made the other believable. But not being much for anything dealing with forests except to build a hideaway there, park ranger threw me. I studied at Second City after that and found it to be a real blast and then did standup comedy for almost a decade. Needless to say, stage fright was no longer a problem. So take one of these tests.
Secondly, look for internships in your fields. It may take some effort to find opportunities, but it will be worth it. You'll also foster connections in these potential careers and possible job offers.
I'd try to offer more suggestions, but quite frankly, these two are tremendously effective. And they were for me. Before I took one of these tests, I'd never heard of such a thing. And it was entertaining in itself. The questions often seem out of left field, but they're based on real statistical correlation and they seem to work. Plus, it's a pretty easy start.