What are the possible reasons for abandoning a novel?

Maybe Dumbledore discovers some dark secret about Harry's past that he can't handle. It could also be that Dumbledore is trying to protect Harry in a really strange way, by pushing him away from the dangerous wizarding world around Hogwarts.

One reason could be a sense of over - whelming responsibility. If Ash has too many Pokemon to care for in the fanfic, he might feel he can't give each one proper attention and thus abandons some. Another possibility is if a particular Pokemon has some sort of 'dark side' or uncontrollable power that Ash fears he can't handle, leading to abandonment.

One reason could be disillusionment. Maybe he discovers that the wizarding world is not as noble as he once thought, with a lot of hidden political intrigue and corruption. For example, the Ministry of Magic might be misusing its power, and Harry, being a symbol of justice, can't stand it anymore.

Maybe it's because she sees Naruto's strength and how he has overcome so many difficulties despite her absence. She realizes that if she had been there, she could have made his journey easier. Also, she might regret not being able to watch Naruto grow up, miss his first steps, first words, and all those precious moments that a mother should be a part of.

In some fanfictions, Annabeth could abandon Percy because of a prophecy. If the prophecy seems to imply that being with Percy will lead to a great disaster, she might choose to leave to protect him or the world. Also, it could be due to a personal growth arc for Annabeth. She may realize that she has been too dependent on Percy in the past and decides to go off on her own to find her true self, leaving Percy behind.

One possible reason could be ideological differences. Naruto firmly believes in protecting his village and his friends, while the Akatsuki has goals that often involve causing destruction and chaos. In fanfiction, Naruto might realize that the Akatsuki's actions go against his own values of peace and harmony, so he decides to abandon them.

Maybe she was forced to for some dark reason. Perhaps there was a threat to Naruto's life if she stayed, and she thought leaving was the only way to protect him.

Well, in some fanfictions, Sirius might abandon Fem Harry because he has some sort of secret mission that he believes is more important than staying with her. Maybe he discovers some dark prophecy related to Fem Harry and thinks that leaving her will change the course of events. Also, it could be that Sirius has his own inner demons, like guilt from his past, and he feels unworthy of being around Fem Harry so he leaves.

One possible reason is the author losing interest. Maybe they started a new project that seemed more exciting. Another reason could be lack of inspiration. If the plot gets stuck and they can't figure out how to move forward, they might abandon it. Also, external factors like a lack of support from publishers or negative feedback from early readers could lead to abandonment.

The literary market has also changed. Publishers are more likely to promote novels that fit current trends or have a wider commercial appeal. Antagonistic novels might not be as marketable as they once were. There could be a perception that they are too formulaic or old - fashioned, and thus they are not being published as frequently, contributing to their decline.