In some fanfictions, Naruto becomes a god and decides to explore different dimensions. He discovers new forms of chakra and brings that knowledge back to his own world. This could lead to new jutsu being developed and a whole new era of ninja training. Also, his god - like status might make him a target for other powerful entities from different realms, creating exciting battles.
One creative plot could be Naruto ascending to godhood and using his new powers to reshape the ninja world. He might create a new system of peace where all the hidden villages are united under one banner. Another idea could be that as a god, Naruto has the power to bring back fallen comrades, like Jiraiya, and they all work together to face new threats.
A really interesting plot is when Naruto becomes a god and he uses his powers to rewrite the history of the ninja world to prevent all the tragedies that happened. He could change the past so that the Uchiha clan never had to face the massacre. This would completely change the present and future of the story, with new alliances and relationships forming.