Perhaps Naruto is fed up with Konoha's fanfiction because he wants a new adventure outside of the village. He has spent most of his life in Konoha and might be craving for a change. He could be bored with the same old politics and power struggles within the village. Also, he may have realized that the ideals of Konoha are not as perfect as they seem, and this disillusionment makes him tired of it.
Perhaps the fanfiction keeps rehashing the same tired storylines about Konoha. Naruto might be tired of seeing the same things over and over again, like always focusing on the village's dark secrets in a clichéd way instead of exploring new aspects of Konoha and its people.
On the positive side, it could inspire new and more creative fanfiction. Fans might try to write stories that Naruto would approve of, exploring different angles of Konoha and his relationship with the village in a more positive and nuanced way to avoid making him fed up.
His relationship with some friends might become strained. For instance, if Naruto decides to leave Konoha, some friends who are more loyal to the village might oppose his decision. However, his true friends will try to understand his reasons. Sakura, for example, might initially be shocked but then come to terms with it as she has seen Naruto's struggles.
One reason could be the lack of recognition he gets in the village despite his great contributions. In the fanfiction, Naruto might feel that his efforts to protect the village are taken for granted.
Well, it might be that the fanfiction focuses too much on Sakura in a way that Naruto feels is unfair to the other characters. Naruto is part of a big world with many important people, and if the fanfic just hones in on Sakura all the time, he could get fed up. Also, if the fanfiction has Sakura constantly putting Naruto down or not appreciating his efforts like in the real story, that could be a reason.
One reason could be that in some fanfictions, the characters of Team 7 are portrayed out of character. Naruto might be fed up if they make Sasuke too brooding in a way that doesn't seem true to the original. Also, if the fanfiction focuses too much on shipping within Team 7, like Sasuke and Sakura, and ignores Naruto's growth and importance, it could annoy him. Another possibility is if the fanfiction makes the team seem too dysfunctional in a way that doesn't match Naruto's view of his comrades.
He could start to oppose the village's leadership more openly. Instead of being the village's hero who always follows orders, he might become a vocal critic. He might use his influence among the villagers to try and bring about change in the way the village is run. For instance, if he thinks the village is being too harsh on the younger generation of ninjas, he could start a movement to change the training methods.
It could lead to a shift in the type of fanfictions being produced. If Naruto getting fed up with Sakura fanfiction becomes a popular concept, more fanfic writers might avoid writing in that vein or might try to rewrite the relationship in a more acceptable way, which in turn changes the overall landscape of Naruto fanfictions in the fandom.
If Naruto gets fed up with Team 7 fanfiction, some fans who love Naruto's perspective might stop reading those fanfictions. This could lead to a decrease in the popularity of certain types of Team 7 fanfictions. Writers might then have to change their approach to keep their readers.