try to fuse other worlds in your fanfic like jjk or something else and make it so that he fuses chakra and cursed energy into a new energy for more power without relying on the system to much. As for more content, try make him unify all the yokai and then the supernatural factions as the first major goal he sets for himself. well thats some of my advice and thoughts hope it helps you

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good story keep up the writing pls dont stop writing