Don’t forget being a legacy. That helps. ;)
The fact is these schools are going to get a plethora of applicants with perfect GPAs and test scores, so they’re going to then look at everything else: extracurriculars, ambition (especially self-motivation), personality (as much as they can gauge it), etc. NYU’s admit rate is about 20%, so it’s not as much of a long shot as Stanford or Harvard, but you’re going to have make yourself stand out.