There could be a group of magical outcasts in Canada who take Harry in. These are people who have been shunned by the mainstream wizarding society for various reasons. They would understand Harry's need to escape and would protect him because they see him as one of their own, someone who is also trying to find a place where he can be safe and free.
It's possible that an old acquaintance from Hogwarts who has family ties in America could assist him. This person might already have a network in America and could introduce Harry to important people. Also, there could be some reclusive magical scholars in America who, out of curiosity about Harry's powers and his role in the UK, decide to help him. They could teach him new magical skills that are specific to the American wizarding world.
Well, in this kind of fanfiction, Harry might meet some new magical creatures unique to Canada. Maybe he'll encounter a friendly Canadian werewolf who helps him hide from any threats sent by the Dursleys or Voldemort's followers.
One possible scenario could be that Harry uses his magic skills in a creative way to escape. Maybe he creates a diversion with a spell to distract the Dursleys and then slips away unnoticed. Another could be that he gets help from an unexpected ally, like a friendly magical creature that guides him out of the house.
The Dursleys are also important characters in this context. Their actions and attitudes towards Harry are what he is escaping from. Petunia's overbearing nature, Vernon's hostility, and Dudley's bullying could all be factors that drive Harry to find a way to leave. And there could be other minor characters from the wizarding world, like a friendly neighbor who is actually a retired wizard and gives Harry some crucial advice or a magical item to aid in his escape.
One possible plot could be that Harry, tired of the constant danger and scrutiny in the UK wizarding world, decides to flee to America. He might encounter new magical creatures unique to America, like the Thunderbird. He could also learn about different forms of magic practiced there, such as Native American magic. And perhaps he'll make new friends who help him hide from those who might be looking for him in the UK.
One possible scenario is that Harry discovers a plot within the Order that endangers him or those he loves. So, he decides to escape in order to protect himself and seek his own way to defeat Voldemort. He could use his skills in stealth and magic that he has learned over the years to slip away unnoticed.
One possible scenario could be that Harry discovers a hidden magical passageway in his tiny bedroom at the Dursleys'. It could be a secret portal created by a well - meaning wizard long ago to help any oppressed magical being in the Muggle world. Harry stumbles upon it while looking for a lost sock or something mundane. Another scenario might be that a group of friendly magical creatures, like house - elves, conspire to help him escape. They create distractions around the Dursley house, like making the pots and pans fly around and creating chaos, which allows Harry to slip away unnoticed.
One possible plotline could be that Harry discovers a hidden magical portal in Hogwarts that leads outside of Britain. Another could be that he fakes his own death and secretly boards a ship bound for a far - off magical land to escape the danger in Britain. Maybe he teams up with some international wizards who help him smuggle out of the country under the guise of a diplomatic mission.
One possible plotline could be Harry finding a hidden portal that leads to a parallel magical world where he can escape the troubles of his own wizarding world. He might encounter new magical creatures and spells there.