Any advice for competitive applicants?

I’m interested to see if anyone who got into a “top” university has any advice about the application process for “competitive applicants.” E.g., how many EAs to apply to (assuming all nonrestricted), and various tips. Personally, I have a 2400/36, 15+ APs/college courses, and several national/international awards, but still am nowhere near a lock for places like MIT/Harvard. I’d appreciate any advice anyone has.