The North could be hit by a strange plague that only affects their livestock and crops. A young healer in the North travels far and wide to find a cure. Along the way, she uncovers a conspiracy by a southern lord who wants to weaken the North. She returns in time to not only save the North's resources but also expose the plot, leading to a strengthening of the North's resolve to be independent and self - sufficient.
A plot could be about the North discovering a hidden resource, like a magical ore that gives their weapons an edge. This would make them even stronger and attract unwanted attention from the other regions. They then have to decide how to use this newfound advantage while protecting it from those who would take it by force.
A really interesting plot could be a time - travel fanfiction where a character from the modern world is transported to the North in the Game of Thrones universe. They use their modern knowledge, like basic science and different leadership ideas, to change the fate of the North. They could introduce new farming techniques or diplomatic strategies, which would create a whole new dynamic in the power struggles of the North.
One possible fanfiction could be about a young lord in the North who unites the various houses against a new threat from beyond the Wall. He uses his wits and the strength of the North's people, along with their loyalty to their land, to form an army that is not only strong in numbers but also in spirit.
One idea could be a story about a young mage in the North who discovers an ancient magic that can control the weather. This magic was long forgotten but is now resurfacing. The mage has to learn how to control it while also dealing with the political unrest in the North.
One idea could be exploring what would happen if a minor character like Gendry had been secretly trained in magic. He could use his newfound powers to unite the smallfolk against the warring nobles. Another plot could revolve around a female knight from the North who disguises herself as a man to fight in the wars, and along the way, she discovers secrets about the White Walkers that no one else knows. Or perhaps a fanfiction where Daenerys and Sansa form an alliance much earlier and together they reshape the power dynamics of Westeros.
A really cool 'Game of Thrones fanfiction' plot could involve the resurrection of some of the dead characters in a different way. For example, what if Ned Stark was brought back not as a vengeful wraith but as a wise advisor to a new king or queen? His honor and wisdom could shape the future of Westeros in a completely new direction. And it would be interesting to see how the other characters react to his return.
Perhaps a fanfiction where Daenerys Targaryen lands in Westeros earlier and forms an alliance with the Starks before the events of the main series. This would completely shift the political landscape and the fight for the Iron Throne. She could bring her dragons to help fight the White Walkers from the start.
One idea could be exploring what would happen if a minor character, like Gendry, had a more central role in the fight against the White Walkers. He could lead a group of common folk and prove that the power doesn't always lie with the nobles.
One idea could be a wizard who uses magic to bring back characters from the dead in a way that completely alters the power dynamics in Westeros. For example, bringing back Ned Stark and having him lead an army of the resurrected against the White Walkers.
A really interesting plot would be if the Night King from Game of Thrones was actually a dark bender from the Avatar world who was banished there long ago. And the only way to defeat him is for the Avatar to travel to Westeros and use all four elements against him. Along the way, the Avatar has to deal with the different kingdoms and their power struggles, just like in the original Game of Thrones story. This would bring in a whole new dynamic of having an outsider with strange powers trying to save a world that is foreign to them.
One idea could be reincarnating as a minor character, like a servant in King's Landing. You could use your modern knowledge to avoid the chaos of the city and slowly rise in power by befriending key players. Maybe you know of some herbal remedies that could save a noble from a deadly illness and gain their favor.