OK I'm going to be the bad guy here. As a person who has been in your shoes but is now in Dentistry, I feel you, but at the same time, I don't. I put in a lot of effort after a series of unfortunate events unfolded onto me. I worked a full time job, took prereqs, studied for the DAT, and shadowed all at the same time and as a result, I got my GPA up and killed the DAT. In fact, every single one of us here went into dentistry for the reasons you listed, but every single one of us put in effort to either get a good DAT, good grades, or both. Yes, dentistry is hard to get into and your stats aren't competitive, but just because of that you want us to give you another path, but only if it makes 100k+? How are you certain you'd even achieve it?
If you're just looking for a back up path to dentistry that guarantees 100k+, I can tell you that there's no such thing, at least not without being extremely lucky or a lot of hard work. So here's the thing. You don't need another path. You need to change your mindset. You need motivation and to put in hard work. With the 50 percentile of the DAT being close to a 18-19 now, scoring a 16 tells me that you did not study. No one who went through 4 years of a biology degree will get a 16 on the DAT if they studied. You proved it the next time you took it, which you scored an 18. Not great, but it means you are capable of growth.
So there's the big secret. If you want to make 100k+, you need to find ways to get motivated and put in the effort. I’m not telling you to keep trying for dentistry. Maybe dentistry isn't for you, maybe it is, it doesn't matter what you choose. You just need to find something that gets you motivated enough to start putting in effort. Realize that these get rich quick schemes usually don’t work out; we can’t just suggest a path for you to take that guarantees 100k+ and you’ll magically get there by taking a few courses. If you can get motivated and get some results, you’ll definitely find a good job, be it dentistry or something else. If you cannot do that, then you will have to settle for a less than glorious job, or a job that doesn't pay 100k+.