Honestly, with your ability and determination thus far as demonstrated by a high SAT and high ACT, straight A’s, and being in AP classes, all by the middle of 9th grade, I would say that you have the right stuff, and are well-started on the path to do very well in college admissions.
Take the most rigorous classes available to you that have good teachers, that you can do well in. Every year, try to get into the best-taught AP classes, because that’s how you get the most out of high school. If your school has a horrible teacher for a particular AP, think about not taking that one - maybe take it as a dual enrollment at a nearby college instead. Many colleges will allow a high school student to take one class for free each semester, so this may be an option for you as you exhaust the options for good APs at your high school.
What do you love doing? Try to pour yourself into becoming very accomplished at that. The most selective schools are often impressed by someone who had followed their extreme interest to a pinnacle of achievement. As a 9th grader, you’re maybe at the “trying things out” stage, and that’s fine. But if there’s something that you’ve already found that you really love, feel free to concentrate on that EC, rather than trying to spread yourself thin on many ECs that you’re not very interested in.
You will take the PSAT in the fall of 11th grade. You can and should prep for this, because the score for it is used for the National Merit competition. If you score highly on this exam, it can open doors to full scholarships at a few flagship state U’s (Alabama, Oklahoma, Arizona are ones that come to mind now), plus it is a way of telling test-blind schools (UC Berkeley, UCLA, and the other UCs) that you have very high test scores.
Go visit schools that are near you, just to walk around and get a feel for them. This may help you to realize whether you prefer a suburban campus, an isolated rural school, an inner-city school with not much campus. When you travel with your family, ask them to take you to visit a school or two there, to help you start to get a feel for campus atmospheres.
Look into summer programs for your areas of academic interest.
Consider a semester or even year abroad during high school, if possible to a third world country that is not commonly chosen, especially if you can learn a valuable language there. Doing this demonstrates extraordinary maturity and resilience. Not many students choose to go to a third world country for a year of high school. It sounds as if you are so far ahead on the academic track here in the US that it wouldn’t harm you to have a year abroad, academically.