I'm not sure specifically as there could be many different interpretations of such a fanfiction. It might be about Harry in a situation where he has to give himself stitches, perhaps after getting injured in a dangerous adventure, like a battle in the wizarding world.
Obviously, Harry would be the main character. But there could also be other characters involved in the events leading up to him having to give himself stitches. For example, his friends like Ron and Hermione might have been there before and left him in a situation where he got injured.
Hermione would be devastated. She would initially think Harry had lost his mind. She'd probably try to find a way to rescue him, using all her knowledge and research skills. Ron would be angry at first, feeling that Harry had betrayed them. But then he would also start to think there must be a deeper reason and would want to help. Dumbledore, if still alive in the fanfiction, would likely be more understanding, believing that Harry has a grand plan that he's not aware of yet.
One plot idea could be that Harry gives himself to Voldemort in an attempt to understand the Dark Lord's mind and find a weakness from within. Another could be that he sacrifices himself this way to protect his friends and Hogwarts, believing that there's a way to turn Voldemort's victory into a defeat from the inside. Or perhaps Harry has a vision that shows this as the only way to truly end the war and he decides to take the risk.
It could be a reaction to the quality or direction of fanfic. Maybe the idea is that the 'Harry Potter' entity, in this made - up situation, feels that the fanfic is not in line with the spirit of the original story. Fanfic can range from really good interpretations to ones that are completely off - base, and if the official side sees too much of the latter, they might want to distance themselves, which is represented by 'giving up' fanfic.
It might also be a creative or satirical statement. Maybe someone is using 'Harry Potter' as a symbol in a fictional scenario where he decides to give up fanfic. It could be part of a discussion about the relationship between original works and the fan - created content that often springs up around them. Fanfic can sometimes be seen as a double - edged sword for the original creators. On one hand, it shows the popularity and influence of the work, but on the other, it can potentially distort or misinterpret the original concepts.
One possible reason could be that J.K. Rowling, the author of Harry Potter, has strict control over the franchise and might have made some regulations that made it difficult for him to continue. Another reason could be that he simply lost interest in writing fanfiction about it. Maybe he wanted to focus on creating his own original stories instead.
One possible reason could be that Ginny realizes Harry is too preoccupied with his heroic duties and she feels neglected. In fanfiction, this is a common trope where the female character desires more attention in a relationship.
Perhaps in the fanfiction, Harry gives up because he becomes disillusioned with the wizarding world. He may see all the corruption and prejudice within it and decides that Voldemort's way of ruling might not be much worse. This could lead to a story where Harry actually joins Voldemort's side, not as a slave but as an 'advisor' of sorts, trying to change Voldemort from the inside. However, this is a very dangerous and morally ambiguous path for Harry to take.
Maybe in the fanfiction, Harry discovers some dark secrets about his past that make him question his whole existence and purpose. Like if he finds out that his parents' sacrifice was part of some bigger, more sinister plan, he could become so disillusioned that he gives up on life. He might think that everything he has been through was a lie and there's no point in going on.