Maybe Harry Potter is wrongly accused of a great crime in the wizarding world of England. The Ministry of Magic, fearing his power or influenced by dark forces in disguise, decides to banish him. He then has to start a new life in other parts of the magical world, perhaps in France or America, facing new challenges and making new friends along the way.
The main antagonist could be a power - hungry wizard in the Ministry of Magic. He might see Harry Potter as a threat to his rise to absolute power. So, he manipulates situations and spreads false rumors to get Harry banished.
Maybe Harry leaves England to explore the wizarding world in other countries. He could go to France to study different magic spells at Beauxbatons Academy. Or perhaps he travels to America to help the MACUSA (Magical Congress of the United States of America) deal with some dark magic threats.
One possible plot could be that Harry discovers he has some long - lost royal blood. He then has to navigate both the wizarding world and the political intrigues of the English court as he tries to balance his newfound status as a potential king. Magic could be used to solve problems within the monarchy, like protecting the king from dark magic threats.
One possible plot could be that Harry Potter discovers his secret heritage as a Prince of England. This might lead to a whole new set of magical and political adventures. He could use his newfound status to reform the wizarding world's relationship with the Muggle government. Maybe he'd introduce magical solutions to some of the Muggle world's problems, all while still dealing with the usual threats in the wizarding world like Voldemort's followers.
Well, it could be about the Queen of England being a secret witch and having a connection to the wizarding world of Harry Potter. Maybe she helps Hogwarts in some way during a crisis, like providing a safe haven on the castle grounds that are protected by magic and Muggle secrecy charms at the same time.
One possible plot could be that Harry Potter discovers he is pregnant (through some magical means perhaps) and decides to leave England because he wants to protect his unborn child from the dark forces that still lurk in the country. He might go to a far - off magical land where he can raise the child in peace and secrecy.
One possible plot could be that the Queen of England discovers the wizarding world through Harry Potter. Maybe she visits Hogwarts and is amazed by the magic there. She could then use her influence in the Muggle world to help keep the wizard - Muggle relations a secret in a more official way.
The plot might center around Harry facing challenges as the king. There could be anti - magic groups within the kingdom who oppose his rule because they fear magic. Harry would then have to find a way to co - exist with non - magical people while still maintaining his magical identity and duties as a king. He might also have to deal with international relations, as other countries might be jealous or fearful of a magically - ruled England.
In some fanfictions, it could be a political move within Hogwarts. There might be a group that wants to undermine Dumbledore's influence, and since Harry is so closely associated with him, they target Harry by getting him banished from Gryffindor. This could also be related to the discovery of some long - hidden secret about Harry's family that makes the Gryffindors view him differently.
Another reason could be related to a new prophecy. Suppose a new prophecy emerged that said Harry Potter's presence in Gryffindor would bring great danger to the house. The Gryffindor students and faculty, believing in the importance of protecting the whole house, might have decided to banish him. But of course, this would be a very difficult decision as Harry has been an important part of Gryffindor before. And in the end, the prophecy might turn out to be misinterpreted.