Perhaps he gets involved in a local magical mystery. There could be a strange magical phenomenon that the local wizards can't solve, and Harry, with his unique experiences, tries to figure it out. He might also have cultural misunderstandings at first. For instance, certain magical gestures or symbols might mean different things in the new country compared to his own.
In this fanfiction, Harry might encounter new magical creatures unique to that country. He could learn different kinds of magic that are practiced there. For example, if he goes to a country in Asia in the wizarding world, he may discover spells related to nature spirits which are not common in his homeland.
Well, he could make new friends. Maybe he meets a local wizard or witch who becomes his guide in exploring the new country. They could show him secret magical places, like hidden magical markets where rare magical items are sold. Also, he might face some challenges, like trying to communicate in a different magical language.
Well, in the new timeline, Harry could find that Voldemort has already won. This would mean he has to figure out a way to either change the past to prevent this future or find a way to defeat Voldemort in this new, much more difficult situation. It would be a huge challenge for him.
Well, he could face a whole new set of challenges. Maybe the magic there works differently. For example, spells he uses on Earth might not have the same effect, or he could encounter a powerful dark force that he has to figure out how to defeat without the help of his usual Hogwarts friends and professors. He'd have to rely on his own wits and the skills he's learned over the years to survive and overcome difficulties.
Maybe he'll have to learn a whole new type of magic. In the other world, the rules of magic could be completely different. Instead of using wands, they might use their minds directly to cast spells. So Harry would have to adapt quickly to survive and figure out how to use this new magic system.
Maybe he'll run into a group of young witches and wizards who are on an adventure of their own. They might team up with Harry and together they explore the new country. There could also be a wise old witch who lives in a secluded magical cottage and gives Harry some valuable advice about the country's magic and its history.
Well, she might face new challenges. In a different school, the curriculum could be completely different. Maybe she'll have to learn new spells or magical theories that are unique to that institution. She could also meet new friends or rivals. There might be a different social hierarchy compared to Hogwarts, and she'll have to find her place in it.
In this fanfiction, Percy might encounter different versions of his friends. For example, Annabeth could be a powerful sorceress instead of a strategist. He could also face new and strange monsters that are unique to that universe.
In this fanfiction, Harry might see a world where magic has evolved in ways he couldn't imagine. Maybe there are new spells and potions that are far more advanced. He could also encounter the future versions of his friends and enemies. For example, he might find out that Ron has become a very important figure in the wizarding world, or that Voldemort's influence still lingers in some unexpected ways.
Well, perhaps Harry would be amazed by the different teaching styles at Beubaxtons. He might make new friends and learn new magic that Hogwarts doesn't teach.
Well, maybe Harry discovers some magical secrets in Salum. He could meet new and interesting characters there.
Well, he might visit some magical places that are not shown in the original books. For example, a hidden beach with mermaids and magical sea creatures. He could also meet some new characters who are on vacation as well, and they could have all kinds of adventures together, like exploring a mysterious forest filled with enchanted plants.