Track is the ONLY non stem-related activity? Nowadays, tippy tops want to see kids climb out of just their interest zones, be open to other sorts of ECs, as well, not simply be unilaterally strong. Yes, see the MIT admission blogs.
Assuming you’re a junior, you have time to make adjustments. You’ll benefit from researching what each of these colleges shows they value and look for. Nothing to lose by expanding a bit.