I'm not sure specifically as there could be many interpretations. It might be about a situation where Harry has reached a point of apathy or detachment in the fan - created story.
It could mean a fan - created fictional story where the character Harry has reached a point of no longer caring about something. Maybe he's been through a lot in the original story context and in this fanfic, he's just given up on caring about certain events, relationships, or goals.
Unfortunately, I can't recommend a 'harry doesn't care anymore fanfic' right away. But when you search on fanfic platforms, make sure to use specific keywords related to the story you expect. For example, if it's a Harry Potter - related fanfic, include things like the setting, other characters involved, or the specific reason why Harry doesn't care. This will help you narrow down your search and find the fanfic you're looking for.
Perhaps in the 'sakura doesn't care anymore fanfiction', Sakura has been betrayed one too many times. She could have been let down by her friends or mentors. As a result, she withdraws from the world around her and stops caring about the things that used to matter to her, like the outcome of battles or the well - being of the village. This change in her attitude would have a significant impact on the story's dynamics.
A new group of rogue ninjas could be antagonists. They might see Naruto's state of not caring as an opportunity to use him for their own evil plans. Maybe they try to manipulate him into helping them steal some powerful ninja artifacts or secrets, and when Naruto realizes their true intentions, he has to fight back.
It could also be developed by introducing a new character or a new situation that makes her question the things she used to care about. Maybe she meets someone who has a completely different outlook on life and it makes her reevaluate her own values, leading to her not caring anymore. In the fanfiction, this can be explored in depth through her internal monologues and conversations with this new character.
Another aspect is how other characters react to her change. Some might be confused, some might try to bring back the old Sakura, and others might be intrigued by this new version of her. This can create a lot of interesting interactions and dialogues in the fanfiction.
One possible storyline could be that Naruto has faced so many disappointments that he decides to isolate himself from the Hidden Leaf Village. Maybe he feels betrayed by the people he once trusted, like some of the village elders. He might then embark on a journey alone, exploring new lands and meeting different shinobi cultures.
Perhaps Harry is so devoted to the original canon of a story, like a book series or a movie franchise, that he dismisses fanfiction. Fanfiction can sometimes deviate a great deal from the original, and if Harry is a purist, he might not care for these reinterpretations. He might think that the original creators' vision should be the only one considered, and fanfiction is just a distraction from that.