DreAm_b0At
i have a feeling the next world might be bleach, if not then bleach will still be part of the worlds the MC will go to. my second guess would be D gray-man due to its enemy being akuma(demons). MC coming from demon slayers and having a sword that can kill demons would be a perfect fit for a new world.
Nice Ending here!!! I'm super touch𼺠I'm happy that he stuck being just a traveler and didn't bring anyone from OP to his nxt world adventure since most fanfics out there who has a world travel scenario would destroy the world's power balance then later bring characters from that world to the next which is not to my taste.