His relationships would also change. Some friends might distance themselves because they are so immersed in the magical world. Others might stay by his side, and together they'd explore a new kind of adventure, one without magic but full of human emotions and real - world challenges.
One possible plot could be that in the fanfiction, Harry Potter is faced with an extremely difficult situation. Maybe he has to make a deal with a dark force to save his friends. For example, the dark force offers to spare his friends' lives if he gives up his humanity. This would lead to him losing his ability to feel emotions like love, compassion, and kindness. He might then start to act in ways that are completely out of character, using dark magic without hesitation and causing chaos in the wizarding world.
It could be the wizarding society itself. If Harry gives up his humanity, the wizarding society might turn against him. They could become the antagonists as they try to stop Harry from causing more harm. The Ministry of Magic could lead the charge, fearing that Harry's new state will disrupt the peace and order they have been trying to maintain. They might use all means necessary, including dark magic if they have to, to subdue Harry.
Maybe he was tired of the constant danger and responsibility that came with magic. In the original series, he faced so many threats. In fanfiction, he might just want a normal life away from all that.
It could be that he got too busy with other aspects of his life. For example, he might have started a new job or hobby that took up all his time, leaving no room for writing or being involved in magic fanfiction.
In some fanfictions, it could be through intense emotional experiences. For example, when he faces a great loss or discovers a deep truth about his family, it triggers something within him and unblocks his magic.
One possible reason could be that he has seen too much destruction and chaos caused by magic. He might feel that it brings more harm than good, so he decides to give it up.
In some fanfiction scenarios, he might give up magic for love. For example, if he falls in love with a Muggle who is afraid of magic or if he wants to live a normal life with his non - magical loved ones. He may think that by giving up magic, he can have a more stable and ordinary relationship.
In some fanfictions, Harry Potter might develop his wandless magic skills through intense mental training. He could practice focusing his magic without the aid of a wand, much like how he learned to control his Patronus. By visualizing the desired outcome clearly in his mind and concentrating his magical energy, he gradually becomes proficient at wandless magic.