A plotline could be that Harry is forsaken by his friends due to a false accusation. He then has to find his own way in the wizarding world, relying on his own skills and some forsaken magical knowledge. He might encounter a mysterious mentor who teaches him these forsaken spells and techniques. As he grows in power, he has to decide whether to forgive his friends or continue on his own path.
Another plotline could involve the amulet having the power to travel through time. Harry uses it to go back in time to learn more about Voldemort's past, in order to find a weakness. This would be a very exciting and complex story, as he would have to be careful not to change the present too much while in the past.
One interesting plotline could be the emancipation of house - elves in a more radical way. Maybe a group of wizards and witches, inspired by Hermione's SPEW, take more forceful actions to give house - elves full rights and freedom, which could lead to a lot of conflicts with the traditional pure - blood families who are used to having house - elves serve them.
One interesting plotline could be a jumper that has special powers. For example, it might be able to transport the wearer to different magical locations in the Harry Potter universe. Another could be a jumper that changes its appearance based on the wearer's mood or the magical situation around them.
Some fanfictions might explore the political power struggle between different pure - blood families. They could show how these families vie for influence within the Wizengamot. It's like a game of thrones in the wizarding world, with each family using their own strategies to gain more power and control over magical policies.
One interesting plotline could be Harry's parents' time at Hogwarts. Maybe exploring how they formed their friendships and dealt with the early signs of Voldemort's rise. Another could be about the Marauders' adventures that were not fully shown in the original books, like their secret pranks and how they influenced the Hogwarts of that time.
A possible plotline could be a time - travel fanfiction where Harry and his friends accidentally travel back in time to the era when the founders of Hogwarts were alive. They get to interact with the founders, learn about the early days of Hogwarts, and face challenges that come with changing the past or ensuring that history unfolds as it should. This would involve dealing with the different magical cultures and practices of that time, as well as the complex personalities of the founders.
Well, perhaps in this fanfiction, the Phoenix plays a role in revealing hidden secrets about Harry's family. It could lead Harry to discover an ancient magic that was long forgotten by the wizarding world, which was somehow related to his family. This could then set him on a new quest, different from the one in the original books, and change the course of the story completely.
One interesting plotline could be about the Founders' initial meetings and how they decided to build Hogwarts. Maybe they had different ideas at first but then came to a consensus on the school's values and layout.
One interesting plotline could be the return of Voldemort in an even more powerful form during a doomsday scenario. The remaining Order of the Phoenix members and Hogwarts students have to find a new, extremely powerful magic to defeat him. Another could be that a dark wizard from outside the known wizarding world arrives during the doomsday and tries to take over the already chaotic wizarding Britain.
Another plot could be about the Minutemen interacting with the Hogwarts students. Maybe they come to Hogwarts for an exchange program. The cultural differences between them and the students at Hogwarts could lead to some really fun and exciting stories. They might introduce new spells or ways of using magic that the Hogwarts students have never seen before.