Perhaps in this fanfiction, Harry being a male carrier means he is carrying an important prophecy or a magical artifact. He then embarks on a journey to protect it from dark forces who are trying to get their hands on it. Along the way, he might face many challenges and make new allies.
It could also be that Harry as a male carrier has a connection to an ancient magic. This connection causes him to have strange dreams or visions. He starts to investigate these, which leads him to discover secrets about his family's past and his own true destiny. He has to learn to control this new aspect of himself while also dealing with the regular threats in the wizarding world.
One possible plotline could be that Harry, as a male carrier, has some special ability or power that he has to hide from the wizarding world. Maybe it's a power that is not fully understood or is feared by others.
There could be a new group of dark wizards or witches who are aware of Harry's status as a male carrier. They might see him as a threat to their plans for domination in the wizarding world and thus try to stop him or take whatever he is carrying for themselves. This new group could have different motives and powers compared to Voldemort's Death Eaters.
One possible plotline could be Harry being easily tricked by dark wizards who take advantage of his naivete. For example, they might convince him to perform dangerous spells or go to forbidden places. Another could be that he misinterprets the intentions of his friends, causing some rifts in their relationships until he eventually learns the truth. Maybe he also gets involved with some new magical creatures that he wrongly believes are harmless because of his naivete.
One possible plotline could be Harry using his vegan lifestyle to promote animal rights in the wizarding world. He might start a club or campaign within Hogwarts to encourage others to be more conscious about their food choices.
Perhaps Harry becomes a priest to atone for the sins and destruction caused during his battles in the wizarding world. His journey could involve him trying to bring peace and spiritual guidance to a war - torn or troubled community. And along the way, he might face challenges from those who sense his 'different' past.
One possible plotline could be that it's the result of some dark magic gone wrong. Maybe a spell was cast on Harry by an enemy of Snape's to embarrass him, and now they have to deal with the consequences together. Another could be that it's part of a prophecy that no one expected, and they must figure out how it fits into the wizarding world's future.
One possible plotline could be Harry trying to gain Tywin's approval while also holding onto his own values. Another could be Harry using his unique skills to help Tywin in his political maneuvers.
One possible plotline could be that Harry, through some magical accident or inheritance, comes to own Draco's family manor. Draco is then forced to interact with Harry on Harry's terms to regain his family's pride. Another could be that Harry wins a bet against Draco and the terms of the bet are such that Harry now has ownership over Draco's time, making Draco do tasks for Harry.
One possible plotline could be Harry being sold due to some dark magic plot against him. Snape then has to deal with this unexpected situation and protect Harry from further harm. Another could be that it's a part of a deal to save the wizarding world, and Snape and Harry must learn to work together in this strange new dynamic.
One plotline could be that fem Harry discovers a hidden connection to Morgana through her magic. Maybe she has some latent powers that are related to Morgana's, and she has to explore this connection to understand more about herself and her place in the magical world.
Perhaps Harry discovers that he has basilisk blood in him. This could change his abilities and how others view him. He might face discrimination from some in the wizarding world who fear the basilisk's power, while others might see him as a potential weapon against Voldemort. The plot could revolve around Harry coming to terms with this new aspect of himself.