Astute advice above. You’re a soph and may be dreaming a little. That doesn’t get you admitted. You need to know what these colleges are really about (not just the vision of them) AND what they want to see in applicants. Columbia is different than Dart and Swat. Etc.
The chance threads don’t show their actual apps, the essay, all the things they wrote in supplements, how they described their activities. Also, we tend to see who got in, not all the others who looked good n chance threads, make it ‘sound’ like they cured cancer or wrote an important paper, but didn’t hit the mark in their apps/supps.
Right now, you need to spend time reading what those colleges say and show, get an idea what they look for, the traits (not just high falutin’ accomplishments.) You will need more ECs, because they like kids who see opportunities, challenge themselves.- and do good in their communities.
Get a Fiske Guide to Colleges, so you can see what’s out there.
And whatever your major is, they need to see depth AND breadth- that you engage in your interest area (stem,) as well as are willing to try new things, are open minded. The competition is fierce and getting more so.