OP wrote: “Colleges don’t want a well-rounded student, they want a well-rounded class.”
Sorry, you’re wrong. You would benefit from a deep look at what the colleges say and show, not what any Tom or Harry says. Be discerning.
You’ve talked of T20 schools. For heaven’s sake, it’s time to put the right effort in and show the right thinking. Getting in at that level is no simple matter of what you want; if you just want to keep as you are, pick easier colleges to get admitted to.
You’ve got decisions to make, a maturity to show. You can’t keep all the fun stuff of younger years and expect to make the college leap on a high level. Learning this NOW will serve you throughout your life.
Once you better understand what they value and look for, you can strategize.