There’s no secret formula for getting into selective schools. Students who got accepted don’t know what it was about their app that tipped the scale in their favor. Students who are academically qualified but didn’t get accepted can’t know for sure why they got that decision either. It’s nice that you want to help other students, but unless you got direct feedback from the college you really don’t know what worked and what didn’t.
I hope you have other affordable options that you’re excited about.