Harry could start to write his memoirs. By putting his experiences down on paper, he not only copes with his own emotions but also hopes that one day, the truth about what happened to him will be known. He might also try to secretly help those in need, using his magic in a more discreet way, showing that even though he's been abandoned, he still has a good heart.
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.
It could also be that Harry himself is so traumatized by the war that he isolates himself. He might push people away, thinking that he's a danger to them. As he withdraws, others might misinterpret it as him not wanting their company and gradually abandon him.
Often, he'll start to heal by reconnecting with nature. Maybe he takes long walks in the Forbidden Forest. It gives him a sense of peace away from the chaos that the wizarding world has become post - war. The quiet and the beauty of the forest start to soothe his troubled mind.
In some fanfictions, Harry simply ignores the ostracism. He focuses on his own life and continues to do what he believes is right, whether it's helping out at Hogwarts or exploring the wizarding world on his own.
He might become more independent. Without the Dursleys, Harry would have to fend for himself. He could start to discover his true powers faster as he no longer has to hide his magic in the Dursley household. For example, he could practice magic freely and develop his skills more quickly.
Harry could become an Auror, as he's always been good at fighting dark forces. Ginny, on the other hand, might continue her career in Quidditch. They would support each other's choices. Harry would cheer for Ginny at her matches, and Ginny would be proud of Harry for his work in keeping the wizarding world safe.
Often, Harry shares his own feelings and traumas from the war with Ginny. By opening up about his nightmares, his losses, and his fears, he makes Ginny feel that she's not alone in her pain. They might sit by the fireplace in the Gryffindor common room, talking late into the night, and in this sharing, find solace in each other.
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.
At first, Harry might be confused. He's used to Ginny being there for him, and suddenly she's ignoring him. He might try to reach out to her a few times, but when she doesn't respond, he could become a bit withdrawn himself, thinking that he's done something wrong.
Harry might become more at peace. After all the battles and losses, he could focus on the positive aspects of life. Luna, on the other hand, could become more confident in sharing her ideas. She no longer has to be in the shadow of the war and can be more outspoken.
In some fanfictions, Naruto might become more withdrawn at first. He could focus on self - improvement, training harder to prove himself. He might also start to question his self - worth since his friends' abandonment makes him feel unwanted.