Maybe in the fanfiction, Obito makes a deal with an enemy that Naruto sees as a betrayal. So Naruto, with his strong sense of loyalty to the village and his friends, decides to abandon Obito. This could lead to a series of events where Obito tries to redeem himself in Naruto's eyes.
Another plot could be that Naruto is tricked into believing a false narrative about the ninja world. Similar to how Obito was manipulated by Madara's lies. He then starts to act in ways that are contrary to his usual self. He might target the other villages, thinking he is doing the right thing for some grand, but misconstrued reason. This would lead to him being at odds with his former friends, who would be desperate to bring the old Naruto back.
One possible plotline could be Naruto growing up on his own, but then discovers some hidden secrets about his parents that change his perspective. Maybe he finds out they had no choice but to leave him. Another could be that Naruto, after feeling abandoned, decides to prove himself to the village in an even more extreme way, like taking on super dangerous missions at a young age.
Maybe the plot could revolve around Harry's past life memories as Obito influencing his decisions in the Harry Potter series. For instance, his views on friendship and sacrifice might be altered. Also, it could be that he tries to find a way to bring back someone he loved, just like Obito did, but in the context of the wizarding world, perhaps trying to resurrect a fallen comrade like Sirius Black or Cedric Diggory.
One possible plotline could be a what - if scenario. For example, what if Obito didn't 'die' and he and Rin finally confessed their feelings and shared a kiss. Another could be a time - travel plot where Obito gets a chance to go back and change things, leading to a kiss with Rin.
Perhaps Naruto starts to question his own identity. Since he was abandoned by his family, he could be on a journey to discover his true heritage and in the process, his dark side grows as he faces many hardships and betrayals. He may then use his new understanding to either wreak havoc or find a way to forgive and move forward.
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.
Often, there's a plotline where Naruto and Obito are on opposite sides of a conflict within the fanfiction. Naruto is fighting for the good of the village and Obito is working against it. Naruto's hatred for Obito grows as Obito continues to cause chaos. There might also be a plotline where Naruto discovers some new, even more terrible deeds that Obito has committed, fueling his hatred further.
Perhaps Fem Naruto travels back in time and teams up with a younger version of Kakashi. Together, they try to save Obito. Fem Naruto uses her female intuition and Kakashi uses his strategic mind. They face many challenges along the way, like dealing with the hidden motives of other ninja clans who might not want Obito to be saved as it could disrupt their own power plays.
One possible plotline could be Naruto growing up on his own, learning survival skills at a very young age. He might become more cynical towards the idea of family. Another could be that he meets someone who becomes like a surrogate family, and through this relationship, he starts to heal his inner wounds. He could also start to search for the reasons why his family abandoned him, leading to a journey of self - discovery.
Perhaps Naruto, after being abandoned by Minato, falls in with a group of outcasts. Together they form a sort of family of their own. Naruto's natural leadership and kind heart start to shine through as he tries to protect this new family. As he uncovers more about his past and Minato, he has to decide whether to forgive his father or hold on to his anger. This internal struggle could be a major part of the fanfiction.