Did you ever share where you did get matched? I don’t see it in your posting history, and I’m sure all of the people who have supported you here would love to celebrate with you… which would be a much better use of energy than Monday morning quarterbacking.
More than 70% of Questbridge finalists don’t match anywhere - you did great! The schools you ranked higher than your match school are the ones that the vast majority of finalists apply to, so they’re choosing a small number of applicants out of a large pool that has already been pre-screened for excellence; every finalist is highly qualified. These schools did not need a reason not to pick you; they assembled the QB Scholar class they wanted, based on a mix of knowable and unknowable criteria.
There is no point in ruminating about what you could have done differently. You could just as easily ask whether a different essay could have caused you not to match at all. You have an enviable opportunity now for a top-tier, debt-free education; try to let the roads-not-taken go and get excited about what’s in front of you. Congrats on matching!