What grad school physics subject would suit me the best?

I made a post earlier asking about people’s grad school experience and a question came up of what I’d study specifically. I was wondering if I could get help on ideas or recommendations of what seems to suit me best?

I love astrophysics and space but I don’t really enjoy coding which is know can be a big part of that. I’d rather theoretical subjects on paper. Subjects like I said with space, gravity and such really peak my interests. If you could maybe ask questions to see what my preferences are, I just feel kind of lost on how and what to pick or orient towards.