Another possibility is that Harry initially gets angry. He has been through so much and saved the wizarding world multiple times, so he might feel betrayed. He could lash out at those who reject him, but then gradually realizes that this isn't the way and instead tries to prove his worth through acts of kindness and heroism again, hoping to win back the hearts of those who have turned away from him.
Perhaps Harry tries to find the root cause of the rejection. He might start investigating if there's some sort of dark magic or false rumor spreading about him that has made everyone turn against him. He could question his closest friends or even seek out the help of some of the more reclusive teachers at Hogwarts to figure it out.
One reason could be a misinformation campaign. Some malicious wizard or witch might have spread false rumors about Harry, making everyone believe that he has done something terrible like being in league with Voldemort again.
He could also give his mate some space for a while. Sometimes, distance can make the heart grow fonder. By giving space, his mate might have time to think about their relationship and realize what they are missing.
Harry could try to communicate openly with his mates. He can explain his side of the story and clear up any misunderstandings. This might be difficult at first, but it's a direct approach.
Harry could try to find out the root cause of the rejection. He might start investigating if there are any external influences on his mates. He could also reach out to other characters for support, like some of the Hogwarts professors. And he might try to prove himself to his mates, by showing them that he's still the same Harry they used to know deep down.
In fanfiction, Harry Potter rejection letters can be a fascinating aspect. They might be letters rejecting Harry from certain opportunities within the wizarding world. For example, he could be rejected from a special magical club or a scholarship. These rejection letters add depth to the story by showing that even the 'Chosen One' isn't immune to setbacks.
Perhaps he is trying to hide his true self. He may have a side of him that he doesn't want others to discover, like some special abilities or a different origin. So, being cold to everyone helps him keep his secrets and avoid getting too close to people who might figure him out.
One common theme is the idea of being an outsider. Harry already feels like an outsider in the wizarding world at times, and a rejection letter can emphasize this. Another theme could be unfairness. The letter might be a result of some sort of prejudice or misinformation within the wizarding community.
He might be initially heartbroken. Harry has always been a bit of an emotional person, so he could go into a state of depression for a while. He might isolate himself from his friends and focus only on his studies or fighting against the dark forces, using it as a way to distract himself from the pain of the rejection.
Often, 'Harry Potter' rejected fanfiction is due to copyright issues. If the fanfic seems to be too much of a rip - off of the original story, without adding any new or interesting twists, it may be rejected. Some fanfictions might also be rejected because they deviate too much from the characters' personalities as established in the books. For instance, if a fanfic makes Hermione completely out of character by making her overly aggressive for no good reason, it could face rejection.
When we say 'harry potter is rejected fanfiction', it might be that the fanfiction in question deviated too much from the essence of the Harry Potter series. Fanfiction often has to balance between creativity and maintaining the integrity of the original work. If it strayed too far, perhaps in terms of character portrayals that were completely out of line with J.K. Rowling's vision, or if it introduced concepts that clashed with the established magic system in Harry Potter, it would likely be rejected.