It doesn’t have to be ECs specifically in Lit or humanities. But something more than unilateral. I make these comments based on experiences with the process. Nor is it “passion.” Having some relevant and focused interests you pursue to some depth is good. But far from all it takes.
You’re a junior, have time to consider this. Imo, it would be a shame to use these 11 months to just percolate on your pre-set ideas, just to dig in your heels. That’s not even the sort of mindset these colleges look for. Nor the sort of curiosity/intellectual breadth.
Beware making your app too much about your future, (which seems to be the primary point of your posts.) Top colleges see themselves as more than career prep institutions. Community service also matters, which is different than simply doing something for no pay. (And certainly not just more stem.)
“Pointy” is not a tip. It can be a critique. I know CC tells kids to just do what they love, to win awards, be pointy, take any leadership titles you can, found something, start a business, write some very unique essay, etc. But it’s up to the applicant to dig in and see what the colleges say and show. Again, because you’re talking about uber competitive colleges, with plenty of applicants who will be taking this further.
The question about future interests is on the Common App. Sure, you can pretend there’s no med interest or may change your mind, but be cautious about the risks. And yes, involvement with something like debate (whatever it is) can make a sweet impression. You don’t want to be seen as stuck in a box, all stem/all the time, except for tennis.
In the end, you will make the choices you decide to make. But don’t make the mistake of assuming that what you think today is how it is/all it takes. You get to choose the colleges you apply to. But the colleges choose the kids they want in their class. Why not learn more about what that is?
Frankly, at this point, I can’t decide if you’re serious or pulling legs.