A possible storyline is that Naruto is framed for a crime he didn't commit in Konoha. Despite his efforts to prove his innocence, the village turns against him. This betrayal makes him lose faith in Konoha. He then decides to leave and start a new life elsewhere. As he leaves, he vows to find a way to expose the real culprits and make Konoha realize their mistake. He travels to different lands, learning new skills and making new allies who help him in his quest for justice against Konoha.
One possible storyline could be that Naruto discovers a hidden Noumu facility and becomes intrigued by the creatures. He starts to secretly study them, which makes his friends suspect he's up to something strange. Another could be that Naruto meets a friendly Noumu - like being who teaches him some unique abilities, leading to Naruto being ostracized by some in the village who fear the Noumu influence.
Perhaps in this fanfiction, there is a dark prophecy that Naruto misinterprets as Konoha being the source of all evil in the ninja world. So, in his attempt to 'save' the world, he decides to destroy Konoha. Also, it could be that an evil entity has merged with Naruto, and the combined power has a grudge against Konoha for some past event.
One possible storyline is that Naruto uses his age - related wisdom to prevent conflicts that were previously inevitable in Konoha. For instance, he might foresee political unrest and take steps to stop it before it starts.
One possible storyline could be that Naruto, feeling constantly neglected, decides to leave Konoha in search of a place where he can be truly accepted. He might stumble upon a hidden village that has its own unique ninja culture and there he begins to train in new and different ways, far from the scorn he faced in Konoha.
One possible storyline could be that they leave Konoha in search of a new way to train. Maybe they've grown tired of the traditional methods in Konoha and believe they can learn more outside. They could encounter new ninja clans with unique abilities that they can incorporate into their own skills.
Another storyline could involve a sports competition at Konoha High. Naruto and his friends form a team for a ninja - themed sport, like a version of capture the flag. They face challenges not only from rival teams but also from internal team conflicts, like Sasuke's initial reluctance to fully cooperate.
There could be a fanfiction that rewrites the history of Konoha in an alternate universe. In this universe, Naruto was never a part of Konoha's story. Instead, it could be centered around a different group of ninja trainees who rise to protect the village. Their abilities, relationships, and the overall plot would be developed without Naruto's character being involved at all.
One plot could be about a young ninja who discovers a new type of eye power in Konoha that is related to the natural elements. This power gives them an edge in battles against enemies. Another could be a story where an ordinary ninja is given the Sharingan through some experimental jutsu gone wrong, and they have to learn to control it while facing the consequences of having an unorthodox power in Konoha.
Well, perhaps in this fanfiction, Naruto has achieved all he can in Konoha. He might have completed his goals, like protecting the village and bringing peace, and now he feels there's nothing more for him there. It could also be that he's tired of the politics or the way things are run in Konoha and has decided he's done with it all.
Naruto might forgive Konoha because he realizes that holding a grudge won't solve anything. He has seen the destruction that hatred can cause, like during the Pain arc. So, he chooses to forgive in order to move forward and bring about positive change. Another reason could be his respect for the previous Hokages and their ideals for Konoha.