i get the feeling your parents are very "You need to win / get a scholarship / tangible thing or it's not worth anything" people. Would it help to show them some articles or something of the benefits of gymnastics for development and life lessons? About how it often leads to kids doing very well in other stuff like university? Would they be open to that or do you think they'd just kinda ignore it?
In the meantime, perhaps you can move through the levels less fast? That way, you can rest your ankle more and you may do better at meets. It's not strange you're having trouble at meets if you went to level 7/diamond in 4 years. You're competing with a lot of kids who trained longer than that, I expect.
For your ankle, I still think you should see a PT, but I can get if your parents can't afford it. I get the feeling/impression finances are also a big reason why they're hesitant about gymnastics... If you can't afford PT or a doctor, consider doing strengthening exercises and looking up free medical resources. (If chalkbucket allows it I can try to help with finding free medical resources, but idk if that's allowed.) And I hope that when your ankles get bad your coaches immediately let you off of ankle events and allow you to do core and upper body work instead (extra bars, handstands, etc), and maybe stretches.
With that all being said, I think it's time for you to think what you want. Do you want to continue doing gymnastics, or are you afraid of not knowing what else to do? If you want to explore other things, that's totally an option. You could try climbing, diving, volunteer work for your applications*(See note below). However, if you're still passionate about gymnastics and it's what you want to do, then I'd try to stick with gymnastics.
PS. About volunteer work for applications or such. Replacing your hobby imo should be with something else you enjoy. If your whole life is activities you don't enjoy, you're gonna be unhappy and you'll probably do worse at those things. Some people say school first. I say YOU first (your happiness and wellbeing), then school.