She could find a mentor. Someone who sees her potential and takes her under their wing. This mentor could guide her and give her the support and positive attention she lacks from her parents.
She could focus on her goals. By devoting herself to becoming a great ninja, she can find a sense of purpose and self - worth. As she achieves success in her ninja training and missions, she starts to believe in herself more. And this self - belief can help her rise above the pain of being neglected by her parents. Also, she may gain the respect of others in the process, which further validates her as a person.
One possible reason could be that they are too involved in their own shinobi duties. The world of ninjas is full of dangerous missions, and they might be constantly away on important tasks, leaving Naruto feeling neglected.
One possible plot could be that in a crossover world, Naruto is somehow neglected by his usual friends and allies. Meanwhile, a Yugioh character, perhaps Yugi, stumbles into this world. Yugi notices Naruto's situation and decides to use the power of the Millennium Puzzle to help Naruto regain his confidence and the respect of those around him. They form an unlikely friendship and together face challenges that the neglect has caused, like Naruto having to prove himself all over again in battles.
The neglect can make her more self - reliant. Since she doesn't get support from her parents, she has to learn to fend for herself. This could lead to her being more independent and strong - willed, always striving to prove herself despite the lack of family encouragement.
It could also be due to personal relationships. Perhaps some of his closest friends get caught up in their own lives. Like Sasuke might be on a long - term mission and not be there for Naruto, and Sakura might be too busy with her medical studies. So Naruto, who is used to having a support system, suddenly feels alone and neglected.
Maybe there are some dark secrets within Konoha that he discovers in the fanfic. These secrets could be related to the treatment of certain individuals or something more sinister about the village's leadership. Discovering such things could make Naruto decide to leave in order to distance himself from the corruption or unfairness.
In such a fanfic, one way could be through some form of power transfer from a character who already has the Rinnegan. For example, if there's a situation where Nagato decides to transfer his power to Naruto before his death. Another possibility is that Naruto discovers an ancient and forgotten jutsu that can grant him the Rinnegan.
Naruto might try to seek attention elsewhere. He could focus on his training more intently. By pouring his energy into becoming stronger, he distracts himself from the pain of parental neglect. Also, his friends could play a crucial role. Their friendship might give him the sense of family and belonging that he lacks at home.
One possible plotline could be Naruto's search for his parents' identity. Even though they abandoned him, he might be curious about who they were and why they left. He could go on a journey, following small clues he discovers along the way. Another plotline could be his struggle to fit in the village. Without the idea of his parents being heroes of the village, he might face more discrimination than in the original story.
In fanfic, Tobirama might have predicted Naruto's arrival in a way. He could have left behind prophecies or clues that are only discovered by Naruto. This makes them related in the sense that Tobirama is guiding Naruto from the past, even if it's indirectly.
One possible reason could be that they are too focused on their own problems or duties. Maybe they are involved in some important shinobi business that takes up all their time and attention, causing them to overlook Naruto.