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.
One possibility is that Sakura has seen the futility of her efforts. She has worked hard towards a goal, for example, trying to win someone's love or gain recognition in her field, but all her efforts have been in vain. So, she decides that she doesn't care anymore. In the fanfiction, this could lead to her taking on a new, more self - centered or detached lifestyle, which would be an interesting exploration of her 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.
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.
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.
It could be Naruto. Since he has always been a big part of Sakura's life, he might be one of the main characters trying to figure out what's wrong with Sakura and how to bring back the old her.
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.
Perhaps Sakura has grown and changed herself. She might have developed new interests and values that are no longer compatible with Sasuke's. In the fanfiction, she could have met new people who showed her a different kind of love and respect, making her question her feelings for Sasuke.
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.
You could try searching on popular fanfiction websites such as Archive of Our Own or FanFiction.net. Just use the exact title in the search bar.
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.
It could be that Sakura has done something that has disappointed Naruto deeply. This could range from her making a decision in a mission that Naruto didn't agree with, to her not being there for him during a difficult time. These actions might have gradually eroded his love for her.