One possible reason could be past betrayals. Maybe he was mistreated by the village in some way, like being blamed for things he didn't do or not getting the support he needed when he was younger. So he feels no obligation to help.
Another reason could be personal growth. Naruto might have realized that he has been used by Konoha in the past. He has sacrificed so much for the village, and now he wants to focus on his own development and the development of his own people outside of Konoha, so he refuses to help.
Perhaps Naruto has been pushed too far by the villagers' continuous mistreatment. Even though he has saved them multiple times, they still show hostility or indifference towards him. So, in the fanfiction, he decides not to help Konoha anymore as a form of self - protection and to break free from this one - sided relationship.
Perhaps Naruto with the Rinnegan has seen a darker side of Konoha that he was previously unaware of. It could be something related to the village's past secrets, such as hidden experiments or unjust actions towards other ninja clans. This new knowledge makes him so disillusioned that he refuses to offer his help. Also, he might have formed new alliances outside of Konoha that he values more and that conflict with Konoha's interests.
It could also be due to a family issue. Maybe there is a conflict within the Uzumaki or Hyuga clans that makes them turn their backs on Konoha. For instance, if the village tries to interfere with the internal affairs of their clans in a negative way, they might decide not to offer their help anymore.
One possible reason could be that Naruto has finally realized that Sasuke has chosen a path too far gone from their village's values. Maybe he feels that Sasuke has caused too much pain and destruction, and bringing him back would not be fair to all those who have suffered because of Sasuke's actions.
It could also lead to new alliances. Other villages might see Naruto's stance and try to form alliances with him, seeing an opportunity to weaken Konoha. This would then put Konoha in a more precarious position and force them to reevaluate their relationships with other villages.
It could also be that Naruto has grown disillusioned with the politics in Konoha. Constant power struggles, nepotism, or unfair treatment of certain groups within the village might have pushed him away. He might feel that his help would only be enabling a corrupt system.
Perhaps Naruto has found a new purpose or community outside of Konoha that values him more. He may be so content with his new life that he simply doesn't want to get involved with Konoha's problems anymore. Konoha's actions towards him could have made him realize that his loyalty was misplaced all along.
One possible reason could be that Naruto feels betrayed by Konoha. Maybe he discovers some dark secrets about the village's leadership or past actions that make him question whether Konoha is truly worth saving. For example, if he finds out that they were involved in unethical experiments or unjust treatment of certain clans. Another reason might be that he has been pushed too far by the villagers' continuous mistrust and discrimination towards him, despite all he has done for them. So he decides he's had enough and refuses to save the village that has not fully accepted him.
One possible reason could be that Naruto feels betrayed by Konoha. Maybe he discovers some dark secrets about the village that make him question whether it's worth protecting. For example, if he finds out that the village elders were involved in unethical experiments or unjust actions against certain groups. Another reason might be that Naruto has different ideals now. He could believe that there are more important things in the world than just protecting Konoha, like bringing true peace to all nations without focusing on one village's interests.
One possible reason could be the constant scrutiny and pressure he faces in Konoha. Everyone has high expectations of him as the Jinchuriki of the Nine - Tails. He might feel suffocated by all the attention and the responsibility thrust upon him. Another reason could be the lack of true understanding from some of the villagers. Despite his efforts to protect Konoha, there are still those who look at him with distrust because of the Nine - Tails inside him.