Hi yoyo, I was in your position five years ago, so let me give you what advice I have.
My background for college applications - High school salutatorian (out of 500), varsity athlete, all-state musician, eagle scout, president of three clubs and drum leader of the 200 member band. I am/was damn proud of that resume and thought I could get into any college I wanted.
Well, I ended up being waitlisted at every Ivy and almost Ivy (except Princeton. Fuck you Princeton). Never even got interviews with anyone except Harvard. Now, why do I think that I was waitlisted instead of accepted? In the years before me, less qualified people than me got into Ivy schools. But I handed in my applications a few days before the deadlines, and am part of the largest demographic applying to Ivy (upper-middle income, white, male). Like it or not, they have rough quotas for their incoming classes. A certain percentage is going to be international, white, hispanic, etc, with a decent amount of wiggle room. If it wasn't, they would be overflowing with Asians because god damn they're harder working than most of the rest of us. So, turn them in now. Just do it. If you're as smart as you say you are, then your writing should be fine. Don't try to be the special flower who writes the perfect essay and gets in. Write something good, memorable, but simple. Have a few people check it, but please just send it in as soon as possible. You are more likely to get in when you send it in the beginning of December than when you send it just before the deadline. Because I have a (hopeful) feeling that when they got to my late application they said "Oh shit, this guy would've been good. Too bad we've admitted all we need now. Let's waitlist him"
So I did end up going to one of my safety schools (American), but used that opportunity to study abroad for a year at a MUCH better school (LSE) and used what I could there to springboard into a much better graduate program (Duke) where I am now. Grad school applications are laughably easy. Just get some good recommendations from professors and (academic) co-workers