Naruto could become more self - centered. Since he no longer has the overarching goal of protecting Konoha, he might focus more on his own needs and desires. For example, he could pursue personal power or adventure without considering the implications for the village.
He may also become more detached. He could isolate himself from his former friends in Konoha and form new relationships outside the village. This would be a significant change from his usually friendly and community - oriented self in the original story.
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.
One possible reason could be that Naruto has been mistreated by the villagers in Konoha for a long time. Despite his efforts to gain acceptance, if he's constantly faced with rejection or unfair treatment, it might lead to him not caring. For example, when he was a child, many villagers shunned him because he was the host of the Nine - Tails. This continuous negative experience could build up over time and cause him to lose his sense of loyalty to Konoha.
One possible reason could be that Naruto discovers some dark secrets about the village leadership that go against his values. For example, if he finds out that they have been using underhanded means to maintain power.
Another reason might be that Naruto is seeking a greater purpose. In the fanfiction, his 'godlike' state could make him realize that there are threats out there that he can't face while being tied to Konoha. He may leave to protect the world on a larger scale, believing that he can be more effective away from the village.
One possible motive could be a misunderstanding. Maybe Naruto discovers some false information that makes him believe Konoha has betrayed him. For example, if he's wrongly led to think that the village elders are planning to harm his friends or his sensei. Another motive could be the influence of a powerful and evil entity that has somehow managed to control Naruto's mind. It could use Naruto's strength to achieve its own goal of destroying Konoha.
He could feel betrayed by the village. For instance, if they wrongly accused him of something or didn't support him when he needed it. In fanfiction, this could lead to him turning his back on Konoha. Another possibility is that he meets someone who convinces him that Konoha's values are wrong, and there are better ways to live outside of the village.
One possible reason could be that Naruto is extremely powerful and his skills are needed to protect Konoha from a new and powerful threat. His combat abilities, like his Rasengan and Sage Mode, are crucial for the village's defense.
One possible reason could be that the fanfiction misrepresents the true essence of Konoha. Naruto has a deep connection to Konoha, and if the fanfiction distorts its values, he might despise it.
In such a fanfiction, one possible scenario could be that Naruto is experimented on for his unique chakra. Maybe Konoha scientists, in a bid to understand the power of the Nine - Tails within him, conduct various tests that are both physically and mentally taxing for Naruto.
One possible reason could be to seek stronger opponents outside of Konoha. Naruto might feel that he has outgrown the training opportunities in the village and wants to face greater challenges.