Perhaps Harry meets magical creatures that are rarely seen by wizards. Since he is out exploring after the war, he might stumble upon a group of centaurs who have their own unique wisdom about magic and the future. He could also encounter veelas, and through his interactions with them, learn more about the different cultures within the magical world. There's also a chance he meets other young wizards who are on their own adventures, and they form a sort of traveling group together.
One possible storyline could be that Harry leaves to explore the wizarding world outside of Britain. He might go on a journey to discover new magical creatures and spells in far - off lands. Another could be that he leaves to find a place of peace and solitude, perhaps in a hidden magical enclave, to deal with the trauma of the war. And he could also leave to train young wizards in secret, away from the public eye, to ensure they are well - prepared for any future threats.
Perhaps he leaves to explore the Muggle world. Harry has always had an interest in Muggles. After the war, he realizes he wants to experience life without magic for a while. He could go to university in a big city like London, study a Muggle subject like history or literature. He'd make new Muggle friends and try to fit in, all while still having his magical abilities hidden, which would add an interesting dynamic to his new life.
He might go to America. The American wizarding world is different from the British one. There are different magical creatures and a different magical culture. Harry could go there to start anew, maybe help out at Ilvermorny or explore the magical wilderness of the States.
One possible storyline could be that Harry leaves to explore the wizarding world outside of Britain. He might go on a journey to discover new magical creatures and spells that were previously unknown to him. Maybe he wants to find a place where he can truly be at peace after all the chaos of the war.
One possibility is that Sirius, having finally been vindicated and after the chaos of the war, decides to travel the wizarding world to heal. He might visit old friends and places from his youth that he couldn't before due to his false imprisonment. He could be on a journey of self - discovery, trying to find his place in a world that has changed so much.
One great 'Harry after the war leaves' fanfiction could be 'The New Beginning' where Harry travels the world to heal from the war traumas. It shows his journey of self - discovery.
One popular 'Harry Leaves After War' fanfiction might be one where he travels the wizarding world to study ancient magic that was lost during the war. He visits remote places, meets interesting characters, and discovers new spells.
Ron could also play a significant role. He might be torn between his loyalty to Harry and his family and the wizarding world. He could join Harry on his travels for a while, or he could stay behind but still be in contact with Harry, sending him care packages of wizarding treats and useful items.
The story could develop in a way that Harry goes through a period of self - discovery. Without the Gryffindor identity, he has to re - evaluate who he is. He might explore different kinds of magic that Gryffindor house never encouraged. This exploration could lead him to new powers and a new understanding of the wizarding world.