I am not in your area, and I have no idea what is available, but what I can say is that choosing a barn and a trainer is difficult. To avoid trainer mismatch, I have a couple suggestions.
One option is, if you plan to show, start by stalking the warmup ring during the division that you would like to show in. Watch how trainers interact with their clients. Look at what the focus is and look for what matches with you. Sounds to me like you’d want to keep an eye out for the trainer with some adult clients on more modest horses who seem to be having a good time and demonstrating respectable, safe, riding.
When you visit the barn, ask a lot of questions about pricing and what the focus of the barn is. A high priced barn that caters to clients with gigantic budgets is probably not going to be a good fit for you. Look for a barn that specifically has other people in your demographic, whatever that is.
Consider your own financial expectations. Your expectations re: what you should be able to accomplish within your budget may not be realistic. I’ll be honest–no trainer wants to deal with the client that is not realistic about costs. They don’t want to waste their time shopping for a unicorn that is unlikely to exist or waste time negotiating charges on monthly bills. (For clarification, a trainer is 100% responsible for correct billing–but OTOH board, training, and show bills can be very complex.) It is incredibly frustrating, but oftentimes trainers don’t even know what things like transportation are going to end up costing–sometimes you do just have to do your own due diligence, which you did. I’m a BO, not a trainer, but even I am leery of clients that seem overly cost conscious because horses always involve a lot of hidden costs–Dobbin suddenly needs special shoes, or a bunch of training rides to correct a problem, or special medication, or an expensive layup–and I don’t want to be dealing with clients that are wringing their hands when things like that come up. In sum, carefully consider your finances, and choose a barn/trainer/horse that is within your finances to where you have a cushion.
Consider the expectations for your own riding. Maybe you are subconsciously choosing more competitive barns because you subconsciously want that, but maybe you’d be more happy IRL at a more laid back, less competitive barn. Maybe you need a barn that will help you get back your mojo via a lower pressure program that will take you back to basics for a period of time. Maybe you’ve sort of had a stressful run of barns and it would be worth considering taking a break from H/J world and hanging out with some eventing folks or dressage folks for a while.
Consider starting small at whatever barn you go to. You’ve had an injury and a concussion, and you also have unfortunately had to deal with some shady people. Start with lessons, increase the number of lessons, try a 1/2 lease, consider a full lease, then consider buying when you are really comfortable with the lay of the land.