One possible reason could be that he has some unresolved issues from his past, like the absence of his parents during his childhood which made him feel a sense of detachment. Maybe he is so focused on achieving his ninja goals that he unconsciously starts to ignore his family. Another reason might be some sort of miscommunication within the family. For example, if there are secrets that the family has been keeping from him, he might feel betrayed and thus choose to ignore them.
In the original Naruto story, family is an important theme. However, in this fanfiction where Naruto ignores his family, the emotional core of the story shifts. The relationships that were built on family bonds are now broken. This can have a ripple effect on the whole plot. For instance, the support system that Naruto had from his family in the original story is no longer there. So, he has to face challenges alone, which may change the way he approaches battles, makes decisions, and interacts with other characters in the Naruto universe.
Often in fanfiction, Naruto ignores his family when he becomes obsessed with power. He may think that the power he gains is more important than his family ties. For example, if he discovers a new form of chakra or a new jutsu, he might seclude himself to master it, ignoring his family's concerns. This can lead to his family feeling neglected and trying to bring him back to his senses.
In some fanfictions, Naruto ignoring his family can be a plot device to create drama. It might be due to misunderstandings. For example, if there's a miscommunication about his ninja duties and family expectations. This can lead to a more complex and angsty storyline as Naruto has to face the consequences of his actions, like strained relationships with his family members.
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.
Perhaps Naruto is being influenced by an outside force. It could be an enemy who has tricked him into believing that his team is holding him back. Or it could be that he has fallen into a dark state of mind, like if he has some kind of mental breakdown due to all the pressure he has faced in the past. In this state, he might just push Team 7 away without really meaning to in the long run.
The plot might involve Naruto being influenced by some external force. For example, a new enemy could be using some kind of mind - control or illusion on him to make him ignore the Rookie 9. Another possibility is that Naruto has become so focused on his training to become stronger that he starts to neglect his relationships with the Rookie 9, thinking that his power is more important for the future of the village.
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 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.
It could be Orochimaru. He's always been interested in Naruto and might come up with a plan to drive a wedge between Naruto and the Rookie 9. By making Naruto ignore them, he could be trying to isolate Naruto and make him more vulnerable to his attacks or manipulations.