What did you do exactly to get admitted into an Ivy League?

I do alumni meetings for my alma mater (one of the Ivies). The one commonality of the accepted non hooked students that I see repeated yearly is that they were clearly able to articulate why they would be an asset to the university. They understand what makes the school unique, and how they will not only fit in, but enhance the student body. There is usually a good fit between the school’s mission and that of the student.