Hey Zeno, do you have an anime list account you can link? It would be helpful to see what you've seen.
I think you might like Yuu Yuu Hakusho, it has very similar theme, feel and fighting. Plus the tournament arc was better here than in HxH.
Claymore, it has epic fights.
Demon Slayer (Kimetsu no Yaiba) always explains the characters thinking but also keeps you wondering what's next, or exposes something new in the characters development and a very intriguing plot that remains complex.
Bit of an offshoot, but I just saw that you tagged martial arts, so I'd like to recommend Histories Mightiest Disciple Kenichi. Hajime no ippo is great too. Check em out