Hey,
I was in a similar position to you back in the day. Took Calc BC as a freshman (5 and A’s both semesters). My high school didn’t offer multivariable, so I started taking courses at a community college, which was one of the best decisions I’ve ever made. Super fun and insightful look into college life and rigor. I would strongly recommend you take classes at CC vs taking them online via AoPS or whatnot. I took courses in vector calculus, linear algebra, statistical methods, differential equations, and partial differential equations after taking BC. Because I chose to take them at CC, I am now almost a senior credit wise even though I am just starting my first year at UCLA.
Whatever path you choose, you’ll do amazing given how bright you are. Best of luck! : )