Well, many fans think it should have had a more conclusive and satisfying ending for the main characters. Maybe with less rushed plotlines and more character development.
A lot of people expected a more balanced power distribution among the kingdoms at the end. Also, some wanted to see more justice for certain characters who were mistreated throughout the series.
The ending could have focused more on the characters' personal growth and development. And a less rushed conclusion, giving each storyline the proper conclusion it deserved.
In my view, it could have ended with a clearer resolution of the power struggles and a more hopeful outlook for the kingdoms. Fewer loose ends would have made it better.
One idea could be to create a story where the ninjas from Naruto are inserted into the political intrigue of Westeros. For example, Naruto, with his strong sense of justice, could find himself in the middle of the power struggle for the Iron Throne. He might try to use his ninja skills to bring peace to the war - torn land, much like he did in the Hidden Leaf Village.
One idea could be a story where Arya meets Lemon in a tavern during her travels. Maybe Lemon has some interesting information about Arya's enemies, and they form an unlikely alliance to take on a common foe.
One plot idea could be that the heir is a long - lost Targaryen who was raised in Essos. They come to Westeros with a new set of values and ideas, trying to unite the kingdoms not through force but through trade and cultural exchange. This heir could face resistance from the traditional lords who are used to the old ways of power struggle.
One idea could be a fanfic that focuses on the backstory of a minor character, like Gendry. Explore his life before he met Arya, how he survived on his own in King's Landing, and his early days as an apprentice to the blacksmith. Another could be a story set in a different part of Westeros during the events of the main series, perhaps in Dorne, and show how the political unrest there affected the common people. A third idea would be to create a fanfic where the White Walkers are not the main villains, but instead there is a new, more insidious threat emerging from within the Seven Kingdoms itself.
In a fanfic, the ancient starship could hold the key to a different kind of power than what is known in Westeros. It could be a power that is not based on brute force or political manipulation, but on knowledge. The characters who discover the ship start to learn about new forms of governance, science, and technology. This new knowledge could either be used to better the kingdoms or to further someone's own greedy ambitions.
One idea could be to write a fanfic about a character who was thought to be dead but actually survived and is secretly plotting revenge. For example, a Stark family member who everyone believed perished in the Red Wedding.
Another approach could be to merge the magic systems. In Dark Souls, there are different types of magic like pyromancy and sorcery. Imagine if these were introduced into the Game of Thrones world. Maybe a pyromancer could influence the outcome of battles in Westeros in a new and unexpected way, or a sorcerer could use their illusions to deceive the power - hungry lords and ladies.
Well, it's hard to say for sure. Maybe it could have had a more conclusive and satisfying ending that tied up all the loose ends.