You can also take a look through past book club picks on the main book clubs threads and see if any appeal to you (for many of them, the club already put together vocab lists, which can help a lot):
I’m currently in a book club reading 暁のヨナ which I’d recommend as a very nice fantasy manga (as long as you don’t mind that it’s still ongoing): 暁のヨナ (Akatsuki no Yona) Book Club Home Thread. The book club is currently on volume 16, but even if you didn’t want to join the club for read-aloud sessions you can always just use the vocab lists. Bonus, this series also has an official English translation, so you could also try buying the first volume in both languages and reading the Japanese side-by-side with the English or referring to the English if you have trouble understanding something.