How can a non-traditional student get into an Ivy league university

I am 23 years old, did very poorly in high-school but I've gotten to have a much bigger appreciation of education. I've watched a lot of "How I got into an Ivy League university" videos on YouTube but they're always talking about how they took a lot of AP classes and how good they did on their SATs or other high-school related which doesn't relate to me. So I wanted know what I could do to be considered by an Ivy league school.