Well, one possible consequence could be that he accidentally harms his friends. His magic might lash out in ways he can't control, like when he's angry or scared. For example, his spells could go awry and hit Ron or Hermione instead of the intended target.
He could start with meditation. By clearing his mind, he might be able to focus his magic better. Just like how in real life people use meditation to gain self - control, in the fanfiction world, Harry could do the same to tame 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.
Well, in the 'Harry Potter loses his magic fanfiction', he could end up finding new strengths within himself. Maybe he discovers that his courage and intelligence are enough to get him through tough situations even without magic. He could also start to see the wizarding world from a different perspective, one of the non - magical people, and perhaps work towards making the two worlds more inclusive.
The story could develop with Harry being shunned by some in the wizarding community. They might see him as a has - been or a disappointment. But he might also find a small group of allies who believe in him regardless of his lack of magic. They could help him find new ways to contribute to the fight against evil, like using his knowledge of magic to outwit dark wizards even without being able to perform spells.
It could be Voldemort. Voldemort might use Harry's love as a weapon against him. He could either kill her or turn her against Harry. Another possibility is Draco Malfoy. Maybe Draco tricks Harry's love into thinking he's a better choice. Or it could be a new, unknown dark wizard who targets Harry through his love.
In some fanfictions, when Harry loses his magic, the story takes a more emotional turn. His friends rally around him, and they all have to adapt to this new situation. The story could also explore how the wizarding world reacts to Harry without his magic. Some might shun him, while others might see him in a new light and offer their support in different ways.
One possibility could be that Harry is cursed by a dark wizard. This curse slowly drains his magic, causing him to struggle with everyday wizarding tasks. He might have to rely more on his non - magical skills and the help of his friends. For example, Hermione could use her vast knowledge to find a way to reverse the curse while Ron provides emotional support.