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.
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.
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.
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.
Well, he might start to explore a new career path in the non - magic world. For example, he could become a writer and write about his past magical experiences from a new perspective.
Maybe for the sake of creating drama. Fanfic writers like to add twists to the original story. Blocking Harry's magic can create a lot of tension and make readers wonder how he'll get out of the situation.
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.
Well, he might feel extremely lost and out of place. His identity has been so tied to his magic throughout the series. He could face a lot of ridicule from those who once feared or respected him for his magical abilities. Maybe he'd have to rely on his non - magical skills like his courage and loyalty more than ever.
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.