In a 'Harry lives by himself' fanfiction, the plot could revolve around Harry's self - discovery. He could be living alone in a wizard - only village on the outskirts. There, he starts to learn new skills such as advanced potion - making. He also might make new friends who are not part of his old Hogwarts crowd, and through these new relationships, he grows in different ways.
Well, the plot could be that Harry, after a big battle, feels a bit lost. He decides to live by himself in an abandoned castle that he renovates with magic. He uses this time alone to train his Patronus to be even stronger. As he lives alone, he also starts to communicate with magical creatures in the area, learning their languages and ways, which makes him more in tune with the natural magic around him.
One possible plot could be that Harry, after years of dealing with the chaos in the wizarding world, decides to live by himself to find inner peace. He might choose a secluded place, like a small cottage deep in the Forbidden Forest. He spends his days studying ancient magic that he never had time for before, and perhaps he starts to document his past adventures in a detailed journal.
Hermione might visit Harry. She would probably be worried about him living alone and bring him some books she thought he'd like or some new potions she'd been working on.
Well, it could be about Harry going through a really tough time, like dealing with intense pressure at Hogwarts. Maybe he's being bullied or facing a lot of stress from his studies or the danger that constantly surrounds him, which leads him to self - harm as an outlet for his emotional pain.
One possible plot could be that Harry and Fleur end up living together due to some post - war arrangements. They might initially have a bit of a cultural clash as Fleur is part - Veela and has her own French - influenced ways, while Harry is very much a product of the British wizarding world. But over time, they learn from each other and become friends. Harry could be teaching Fleur about some of the more unique aspects of Hogwarts' history that she might not know, and Fleur could be showing Harry some of the beautiful magic she learned in Beauxbatons.
Perhaps they live together because they both feel a bit out of place in the regular Gryffindor dormitory. They start a little project where they try to combine their magical skills. Harry's talent for Defense Against the Dark Arts and Neville's growing confidence in his own magic could lead to them developing new spells or magical techniques. They might also have a shared garden where Neville grows magical plants and Harry helps protect them from dark creatures that might be attracted to the powerful magic of the plants.
Well, perhaps the plot could involve Harry having to fend for himself from a very young age in the wizarding world. He might have to figure out magic on his own, without much guidance from adults. Maybe he starts exploring the secrets of Hogwarts by himself earlier than in the original story, leading to all sorts of unexpected adventures.
The plot could involve Harry having some trouble controlling the simulacrum at first. It might start acting on its own and causing chaos in Hogwarts. This could lead to Harry having to figure out how to properly manage it and also deal with the consequences of its actions among his friends and teachers.
One possible plot could be that Harry, after years of feeling unappreciated or burdened by his fame in the wizarding world, decides to disown himself. He might leave Hogwarts and the wizarding community behind, perhaps to live as a Muggle. He could change his identity and start a new life, away from the constant danger and expectations that come with being Harry Potter.
One possible plot could be that Harry, for some reason, has to leave the Dursleys earlier than in the original story. The Greengrass family takes him in. Maybe Daphne Greengrass and Harry become friends and study magic together. They could also face some threats from the Dark side, and Harry's presence in the Greengrass family might put them in danger, but they all stand together to fight against it.
Well, perhaps the plot could be that Harry is on the run from some dark forces and the trunk becomes his only safe haven. He might have enchanted it to be much larger on the inside, like the Room of Requirement. Inside, he could have all his essentials, his school books, his owl, and a little bed. He uses magic to keep it hidden and moves from place to place without being detected.
Well, one possibility could be that Harry discovers a hidden magical island. He might find new magical creatures there and learn unique spells to survive. Maybe he builds his own little wizarding home on the island.