Focusing on interest in STEM or humanities in essays?

I’m applying to colleges this fall and my top choices are MIT and a few ivies (Princeton, Yale, Cornell, Dartmouth). I’m also planning to apply to a few top LACs including Williams, Pomona and Swarthmore. (dw I have backups)
Several of the essay prompts are related to an academic interest I had or something I pursued learning out of passion, and I was wondering it’s better to focus on the STEM side or the humanities side. I’m an Asian international (Korea) so I feel like they’re going to expect a perfect STEM skills and interest and they expect the humanities side to be the relative weakness.
In STEM I like physics, math, and computer science, I took all these courses at highest possible level at my school and I have pretty good scores for them. I also have some activities in computer science like volunteering to teach programming or making my own programs.
In humanities I’m a history/polisci fan, I’m really passionate about history (especially the parts related to Russia, Prussia/Germany and Eastern Europe) and I spend quite a lot of my time reading and writing about political thoughts. One weakness if I choose to focus my essays on this would be that I don’t really have explainable activities in this field apart from teaching myself German and Russian little bit. Or would this be an advantage, because my STEM-related activities are already in my activities section and I’m using the essays to demonstrate my interest/passion in the humanities?
I really don’t prefer one over the other, I think I can write essays with an equally passionate/personal voice for both topics.

TL;DR: do you think it’s better to write about STEM or humanities in my essays?
Thank you

Humanities. Use the essays to talk about what you haven’t already covered that much in the EC section and show AOs what you’re like outside of STEM.