Perhaps in the fanfiction, Naruto could face opposition from some in the village after the fight with Sasuke. Some villagers might be afraid that Naruto will let Sasuke off too easily or that Sasuke will pose a threat again. Naruto then has to deal with this internal conflict within the village while still trying to keep his connection with Sasuke alive.
Another idea is that Naruto, after the fight, focuses on rebuilding the relationship between himself and Sasuke. He might constantly reach out to Sasuke, inviting him to return to the village. Naruto could be shown trying different ways to convince Sasuke that there is a place for him in Konoha and that they can work together for a better future.
One possible reason could be that Sasuke might have gone too far in his pursuit of power even after the war. He could have been a threat to the newfound peace in the ninja world, and Naruto, as the protector of peace, might have felt he had no other choice.
Another plotline might be that Tsunade is affected by some kind of dark magic or genjutsu that makes her turn against Naruto. Naruto, realizing it's not really Tsunade's fault, still has to fight her to try and break the spell. He could call upon his friends for help, but in the end, it's his determination and his bond with Tsunade that helps him reach her and break the control.
A storyline could involve a time - travel element. Naruto, Sasuke, and Sakura are sent back in time and find themselves in a situation where they have to get married to change the future. They start off as reluctant partners but as they spend more time together in the past, they develop real feelings for each other. They also have to hide their relationship from their past selves and other characters while trying to figure out how to change the future.
One possible storyline could be a team - up adventure. Naruto, Yakumo, and Fem Sasuke might be forced to work together to face a common enemy, like a new powerful ninja from a far - off land. Along the way, they could learn about each other's skills and personalities. Naruto's positive energy might start to break down Fem Sasuke's cold exterior, while Yakumo's unique abilities could be the key to solving some of the challenges they face during their journey.
One possible storyline could be that Naruto somehow ends up in Mizore's world. Maybe through a strange jutsu gone wrong. He could then use his ninja skills to help Mizore in her own adventures, like fighting off some new threat that her world is facing.
Perhaps in this fanfiction, Naruto is in a wheelchair because of a curse or some kind of poison. His friends rally around him to find a cure. Meanwhile, he discovers new aspects of his ninja way, like focusing on mental strength and strategy more. He might also have to face some villains who underestimate him because of his disability.
One possible plotline could be that Naruto, having a fundamental difference in ideology with Sasuke, decides to take a stand. Maybe Sasuke is on a path that Naruto believes will destroy the village or their friends. So Naruto uses his newfound powers, perhaps a combination of Sage Mode and Nine - Tails chakra, to directly confront Sasuke. Naruto could try to break Sasuke's resolve through sheer force and the power of their friendship memories.
One possible storyline could be that Naruto's parents, Minato and Kushina, are alive and they train Naruto from a young age. This would make Naruto an even more powerful ninja earlier on. He would grow up with their love and support, and perhaps not be as much of an outcast in the village as he was in the original story.
Another storyline could be set in an alternate universe where Naruto has always been a swordsman. He and Tenten are part of a group of warriors. There's a tournament, and they decide to enter as a pair. They train together, and during this process, Naruto helps Tenten overcome some of her insecurities about her skills, while Tenten teaches Naruto some unique weapon - handling techniques.
One possible storyline could be that Naruto discovers he has long - lost relatives. Maybe his father had a secret sibling and Naruto stumbles upon this family during a mission in a far - off village. This new family could be very different from the friends he grew up with in Konoha, introducing him to new ways of life and ninja techniques.