By fall of senior year, the typical compelling applicant to a top tier college will have much more than stats and dreams. There will be experiences in the hs (clubs/activities,) experiences outside hs (community service, maybe local organizations, and for many kids at this level, some real world experience in the field you hope to major in.) If you’re thinking museum studies or perhaps education, the museum and library work might be ok, but you haven’t told us what you hope to study. And even so, the competition for an admit, especially from your area, will have been doing more. Depth and breadth.
Then, yes, there’s the writing. How you answer will show them your understanding and thinkng skills. You have to rise to the level of their thinking and expectations. The top colleges don’t mess with “dreams” and “I WANT.” They look for proofs you are their type, down to attributes and traits. I don’t think you know what those are, not even close.
If you come on with any hint, eg, that you do think you’re better than the average Brown admit, you’re out.
Why the rush?
Don’t tell us you just like to set high goals and feel the competition. Great, but for a tippy top applcation, that’s empty. It’s another signal of “young.” Face it and take the right steps first.