A plotline could also be Harry's journey to understand why his friends abandoned him. He could start to question their loyalty from the very beginning. Maybe he uncovers secrets about his friends that make him realize they were never truly there for him. Along the way, he could make new friends who are more genuine and loyal, but he still has to deal with the emotional scars of the abandonment.
One possible plotline could be Harry feeling extremely depressed at first. He might isolate himself even more, spending long hours in the library or wandering the Forbidden Forest alone. Another plotline could involve him finding new, unexpected allies who help him grow stronger and more independent. For example, he could befriend some of the house - elves who have their own unique magic and knowledge.
One possible storyline could be that Harry discovers his friends have been influenced by dark magic or a powerful spell that makes them shun him. He then has to find a way to break the spell while also dealing with his own feelings of betrayal and isolation.
Perhaps a plotline where Harry's abandonment by Gryffindor makes him more vulnerable to the influence of dark forces. He could be targeted by Death Eaters or other dark wizards who see his isolation as an opportunity. However, this could also lead to him finding new inner strength and ultimately proving that he doesn't need Gryffindor's approval to be a great wizard.
Perhaps Harry Potter gets lost in a mysterious Chinese magical forest. In this forest, he encounters ancient Chinese magic that is both fascinating and dangerous. He has to use his existing skills from Hogwarts along with what he learns in this new environment to find his way out and also figure out why he was abandoned in China in the first place.
One possible plotline could be Naruto growing up on his own, but then discovers some hidden secrets about his parents that change his perspective. Maybe he finds out they had no choice but to leave him. Another could be that Naruto, after feeling abandoned, decides to prove himself to the village in an even more extreme way, like taking on super dangerous missions at a young age.
One possible plotline could be them teaming up to solve a mystery within Hogwarts that the teachers are unable to figure out. Maybe it's about a hidden chamber or a strange magical occurrence. Another could be Daphne helping Harry deal with his PTSD from his encounters with Voldemort. They could also form a study group together and end up learning new and rare magics.
One possible plotline could be Harry feeling extremely isolated and trying to find new friends outside of his usual circle. Maybe he starts to focus more on his studies and discovers new magical abilities on his own.
One possible plotline could be Harry finding a new family among the magical creatures. For example, he might be taken in by a friendly centaur herd who teach him their ways of magic and survival. Another could be Harry being found by a secret group of wizards who are against the Dursleys' cruel treatment and they help him develop his magic in a more positive and nurturing environment. And there could also be a plot where Harry discovers a hidden magical power within himself as a result of the abandonment, like the ability to communicate with the spirits of Hogwarts, which then guides him on a new path to face Voldemort.
Maybe in the fanfiction, Obito makes a deal with an enemy that Naruto sees as a betrayal. So Naruto, with his strong sense of loyalty to the village and his friends, decides to abandon Obito. This could lead to a series of events where Obito tries to redeem himself in Naruto's eyes.
Perhaps Naruto starts to question his own identity. Since he was abandoned by his family, he could be on a journey to discover his true heritage and in the process, his dark side grows as he faces many hardships and betrayals. He may then use his new understanding to either wreak havoc or find a way to forgive and move forward.
Harry can focus on self - improvement. He can pour his energy into his studies, become an expert in different branches of magic. This would not only boost his confidence but also make him more independent. For instance, if he masters advanced potions making, he'll feel a sense of accomplishment on his own.