Maybe there has been a shift in the focus of the fanfiction community. If new characters or concepts have become more popular, and Harry is no longer at the center of attention, it could be seen as him being 'done' with the wizarding world fanfiction. He might be pushed aside in favor of these new trends, and so it's as if he's had enough and is leaving the scene.
It could be that Harry has faced so many challenges in the fanfiction that he's simply burnt out. Just like in real life, if a person endures too much stress or hardship, they might want to step away. In the fanfiction, Harry may have reached his limit of what he can handle in the wizarding world.
Perhaps the author of the fanfiction has decided to end Harry's story in the wizarding world. It could be due to a lack of new ideas, or they want to explore other concepts. It might also signify that Harry has achieved all he can in that world in the fanfiction and there's no more room for development.
Maybe he thinks it distorts the real story of the wizarding world he knows. Fanfictions often take creative liberties that might go against his own experiences and the original narrative.
Some might be angry, thinking he's abandoning his responsibilities. The Ministry of Magic might try to persuade him to come back or even use force if they thought it was necessary for the safety of the wizarding world. His friends, on the other hand, would likely be sad and try to understand his reasons. They might also try to convince him to return, as they know how much he means to the fight against evil in the wizarding world.
Harry would need to learn about the different magical laws in America. For instance, the regulations regarding magical creatures might be stricter or more lenient compared to the UK. He might also have to get used to the different currency used in the American wizarding economy.
They would be devastated. Harry has many friends and allies. People like Hermione and Ron would be heartbroken and would probably seek revenge. The Hogwarts faculty would also be deeply affected. Dumbledore, if he's still alive in the fanfiction, would feel a great sense of guilt for not protecting Harry better. There might be a split in the wizarding community, some believing the Dursleys were acting on their own, others suspecting a darker conspiracy.
There would be a great deal of shock and confusion. Many would start to question everything they had believed in. Families would be divided. Some might think that Harry had been corrupted by Voldemort's dark magic and try to find a way to reverse it. The Ministry of Magic would be in a panic. They would try to come up with new strategies to deal with this new threat. Teachers at Hogwarts would be worried about the safety of their students. And the Death Eaters, while initially happy to have Harry on their side, would also be suspicious of his motives and loyalty.
Their marriage might also change the way different wizarding families interact. Since Harry is famous and Tonks comes from a well - known family, their union could bridge gaps between different social groups in the wizarding world. This could lead to more cooperation in areas like magical research and international relations.
The wizarding world would likely be in shock. Harry is seen as a symbol of hope against Voldemort. His death at the hands of Vernon would be a huge blow. There would probably be a lot of anger towards the non - magical world for allowing such a thing to happen.
There would be shock and disbelief. The wizarding world has always seen Hogwarts as a symbol of hope, knowledge and safety. If Harry destroys it, many would be in denial at first, thinking it couldn't be true. Wizards and witches from all over would come to the ruins, trying to figure out what had happened.
The wizarding world would be in shock. Harry is seen as a hero, and for him to kill Draco, even if Draco was from a 'less popular' side, would be a huge scandal. His friends like Hermione and Ron would be deeply conflicted. They would be torn between their loyalty to Harry and their disbelief at his actions.