Well, it could start with Harry being wrongly accused of something major, which leads to everyone abandoning him. He then embarks on a solitary journey to find the truth and clear his name. During this time, he might encounter old enemies who see his vulnerability and try to take advantage of it. However, Harry's determination and the few skills he has managed to retain despite the abandonment help him fight back. He also has internal battles with feelings of loneliness, betrayal, and self - doubt, but ultimately he rises above it all to show that he is still a force to be reckoned with.
The Ministry of Magic could be the main antagonist. They might be the ones who spread lies or misinformation about Harry, causing everyone to abandon him. They could be afraid of Harry's power or have some ulterior motives to get rid of him. They could use their influence and authority to turn the public against Harry, making his life a living hell as he tries to survive on his own.
She could focus on her studies even more. Since she loves learning, she might bury herself in books and research. This would not only keep her occupied but also make her stronger magically.
Perhaps he is trying to hide his true self. He may have a side of him that he doesn't want others to discover, like some special abilities or a different origin. So, being cold to everyone helps him keep his secrets and avoid getting too close to people who might figure him out.
In some fanfictions, it might be part of a dark plot. There could be a powerful dark wizard or witch who has the ability to manipulate people's minds. They make everyone believe that Hermione is a threat and thus cause them to abandon her. This can add a lot of drama and conflict to the story.
Harry can focus on self - improvement. He can pour his energy into his studies, become an expert in different branches of magic. This would not only boost his confidence but also make him more independent. For instance, if he masters advanced potions making, he'll feel a sense of accomplishment on his own.
He might become very self - reliant. Since he has no one to depend on, he learns to take care of himself in every aspect, like finding his own place to live and getting food. He could also start to study magic more independently, exploring areas that were previously forbidden or not well - known.
His closest friends like Ron and Hermione would probably be the most affected. They are used to having Harry around and relying on him. His sudden ignoring would leave them confused and worried.
One reason could be a misinformation campaign. Some malicious wizard or witch might have spread false rumors about Harry, making everyone believe that he has done something terrible like being in league with Voldemort again.
Dumbledore could be a savior in this fanfiction. He has the power and the wisdom to step in and help Harry. He might have been waiting for the right moment to remove Harry from the Dursleys' influence. Also, there could be a new character, like an old and powerful wizard who has been in hiding but senses Harry's distress and comes to his aid. This wizard could have some unique magical abilities that can protect Harry and help him grow into a powerful wizard himself.