Naruto could also offer incentives for Uzumaki to have children. For example, providing better living conditions, education, and protection. He might also use his influence to find suitable partners for the remaining Uzumaki members, both within the village and from other allied villages. This way, they can start new Uzumaki families and gradually increase the clan's numbers.
Naruto, after being banished, could focus on rebuilding Uzumaki in a more spiritual sense at first. He'd research and revive the old Uzumaki traditions, such as their unique festivals and religious beliefs. This would attract people who feel a connection to the Uzumaki name. Then, he'd gradually build a physical settlement. He might even make alliances with other small ninja clans that were once friendly with the Uzumaki. As his new Uzumaki community grows, it becomes a place of refuge for those who are discriminated against in other villages, and Naruto's leadership makes it a force to be reckoned with in the ninja world.
Well, it could involve Naruto gathering the remaining Senju descendants. He might use his influence to encourage them to revive the clan's traditions. Maybe he'd start by finding old Senju scrolls and teachings to share with the new generation.
Well, he could start a family with Hinata and have lots of kids, passing on his Uzumaki bloodline. Then, he could encourage his friends who have some Uzumaki connection, like Karin, to also have families and pass on their Uzumaki genes. He could also set up a school or training center in the Uzumaki land, teaching the Uzumaki ways of life and ninjutsu, which would attract orphans or those who want to be part of the Uzumaki clan.
The main antagonists could be some of the conservative elders in the Hidden Leaf Village. They banished Naruto in the first place and would see his rebuilding of the Uzumaki clan as a threat to their power. They might try to undermine his efforts by spreading false rumors about him and his new clan.
Naruto could learn about the Uzumaki clan's sealing techniques. They were masters of sealing jutsu. In the fanfiction, he might find out how they developed these complex and powerful sealing techniques, which were passed down through generations. It could be that he discovers some unique seals that were only known to the Uzumaki clan and how they were used for various purposes, like containing powerful entities or storing chakra.
There are fanfics that center around the Uzumaki clan's origin. Some might describe how they came to be so powerful in sealing. A really good one could be a story where the Uzumaki clan members who survived the destruction of their village, other than Naruto's mother, come back and help Naruto understand his heritage better. They could teach him things that even Jiraiya didn't know about the Uzumaki.
The Uzumaki clan bloodline can also be used in fanfics to explore family and heritage. Characters might discover long - lost secrets about their Uzumaki ancestry that change their view of themselves and their place in the ninja world. It could be something as simple as a new jutsu that was forgotten by the clan but is now accessible to the main character because of their Uzumaki blood, or it could be a much deeper connection to a prophecy or an ancient power.
Well, it could be that the Uzumaki clan has some hidden knowledge or ancient artifacts. In the fanfiction world, they might discover an artifact that has the power to save Naruto from a life - threatening situation. Maybe it's a charm that can heal his wounds or reverse a curse placed on him. And since the Uzumaki clan has a rich history, there are many ways they could use their heritage to save Naruto.