You appear to be a competitive candidate. Congratulations on all that you have achieved.
All single digit acceptance schools are highly unpredictable and Brown is particularly idiosyncratic. With that said no one can give you an accurate assessment because most estimates suggest 2/3 of candidates at schools such as Brown tick all the academic credential boxes.
The best advice I can offer is make sure your application is authentic, passionate and displays a consistent narrative that highlights what you uniquely could bring to the Brown community and what Brown will uniquely provide to help you achieve both your academic and life goals.
I know this sounds daunting but I literally know dozens of recent unhooked Brown grads and almost all had great credentials and something else that made them stand out. Go into this process knowing that it is not what makes your application look like it belongs (great grades, test scores, rigor, etc) but what makes it stand out amongst those that are qualified.
Most informed advice will come from your GC who will have the necessary context.
Good luck!