It could have Naruto discovering long - lost jutsu in the Uzumaki library. Maybe some ancient scrolls that hold the secrets of powerful chakra control techniques.
Some Naruto - centered forums might also be a good place to look. Fans often share their fanfictions there. You can engage with the community, ask if anyone has come across a fanfiction about Naruto finding the Uzumaki library, and they might be able to point you in the right direction.
The scrolls could hold secret jutsu. Uzumaki clan was known for unique abilities, so it might be something like a powerful sealing jutsu. Maybe Naruto discovers a new way to enhance his Rasengan using the knowledge from the scrolls.
Maybe it contains some long - lost jutsu. Uzumaki clan was known for their powerful sealing techniques, so it could be a scroll with a unique sealing jutsu that Naruto can learn and use to his advantage in battles.
Well, it could be that Naruto stumbles upon the Uzumaki temple while on a mission. Once inside, he might encounter some sort of guardian spirit. This spirit could test Naruto to see if he's worthy of the Uzumaki heritage and the treasures within the temple. If he passes the test, he could gain access to special Uzumaki artifacts.
In these fanfictions, a major element is often the exploration of the Uzumaki clan's unique abilities. For example, their sealing techniques are often a big part of the story. Also, the sense of family and belonging that Naruto gains from finding his clan is crucial. He might meet relatives or learn about the Uzumaki's role in the ninja world's history. This gives him a new perspective and a stronger sense of purpose.
I recall a fanfic called 'Sentient Library: Naruto's New Ally'. In it, the sentient library is a sort of magical entity that has been observing the ninja world for ages. When Naruto finds it, it offers him knowledge that was lost over time. It shows Naruto different historical events through magical books, which gives him an edge in battles and also in understanding the politics of the ninja villages.
Naruto could encounter a group of rogue ninja who are also after the treasures in the Uzumaki temple. Then he'd have to fight them off to protect the temple and its secrets.
Naruto could find a book that tells the story of a great hero who was just like him, full of energy and a desire to protect. This could inspire him to new heights. He might also accidentally trigger a trap or a hidden mechanism in the library while exploring, leading to an adventure filled with challenges and puzzles to solve.