It's possible that in this fanfiction, Naruto has been through a lot on his own and feels that his family hasn't been there for him when he needed them. So when the time comes for him to help them, he refuses out of a sense of resentment. For example, if his family had previously ignored his pleas for help or had been critical of his actions, he may now turn his back on them when they need his assistance.
In the context of the fanfiction, Naruto might have his own goals and ambitions that conflict with helping his family. He could be focused on a personal journey, like self - discovery or achieving a certain power level, and he sees helping his family as a distraction from that. Also, there could be external factors, such as the family having done something that goes against Naruto's principles, which makes him reluctant to step in and assist.
Maybe he has some personal grudges or misunderstandings within the family in the fanfiction. It could be that something happened in the past that made him feel betrayed or unappreciated, so he refuses to offer help.
Maybe he has some personal grudges against the village. For example, he might have felt betrayed by the village in the past and that made him reluctant to offer help.
The plot may start to revolve around the family's struggle without Naruto's help. This could involve them trying to prove that they can manage without him or trying to find a way to make Naruto change his mind. At the same time, Naruto's own journey might continue separately, but his actions or lack thereof will always be in the background of the family's situation. It could also lead to new alliances or enemies being formed as a result of the family's new situation without Naruto's support.
Well, in fanfictions, often the plot takes a different turn. Naruto might hide from his family because there could be some sort of misunderstanding. For example, there could be false rumors about him being involved in something bad. And he might think that his family would believe those rumors without giving him a chance to explain. So, to avoid the immediate confrontation and judgment, he chooses to hide.
One possible reason could be that his newfound 'godlike' powers make his family feel estranged. They might not understand his sudden transformation and the magnitude of his power, which creates a sense of fear or discomfort, leading them to ignore him.
Maybe Naruto has had some deep misunderstandings or grievances with Konoha that make him unwilling to offer help.
He could also distance himself from them. Naruto might choose to avoid his family, not wanting to be around them as a way to show his anger. He could move out or stop participating in family activities.
Maybe in some love fanfictions, the writers distort the original family relationships in Naruto's story. They might create untrue or negative scenarios about his family, which makes Naruto seem to 'hate' his family in those fictional settings.
He might try to prove himself. Naruto has always been a determined character. So he would likely strive to show his family that they are wrong about him. He could do this by achieving great things in the ninja world, like mastering new jutsus or completing difficult missions.
One reason could be that Naruto has been through a lot of hardships related to his family in the fanfic. Maybe they didn't support his growth to this godlike state, or they tried to use his power for their own gain. For example, if his family had always been jealous of his potential and when he finally reached this ultimate power, he realized their true nature and decided to cut ties.
Well, it could be because fanfiction often goes against the original vision of the author. Harry Potter might not want to be part of something that could distort his story or the world he belongs to.