Perhaps he received some negative feedback that discouraged him. If he constantly got comments saying his fanfiction wasn't good or was inaccurate in some way, it might have made him lose his motivation and ultimately give it up.
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.
Maybe he lost interest. Fanfiction can be time - consuming, and perhaps he found other hobbies or activities that were more appealing to him.
Maybe he got tired of it. Fanfiction can be time - consuming and he might have wanted to focus on other things in his life, like his real - life adventures or relationships.
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.
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 found the fanfiction community too chaotic or full of drama. There might have been arguments, or the quality of the works he was reading had declined, leading him to give it up.
Maybe he just lost interest in it over time. Fanfiction can be a passing fancy, and perhaps he found other hobbies or forms of entertainment that appealed to him more.
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.
Perhaps he realizes that the fanfiction is taking him in a direction that doesn't align with his true character. Harry is known for his integrity, and if the fanfiction was making him act out of character, he might give up.
One consequence could be that his fans were disappointed. If he had a following for his fanfiction, they would no longer have new stories from him.
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.