He could use it to discover more about his Uzumaki heritage. Maybe the sword has some special powers or markings that are related to the Uzumaki clan. It could also put him in danger as others might be after the sword for its power or value.
He might start training with it. Naruto is always eager to improve his skills, and a new sword could be a great addition to his combat abilities.
The sentient sword could also have a tragic past. Maybe it was once used for evil and now wants to atone by helping Naruto. It could share its knowledge of ancient jutsu or forgotten battles with Naruto, which would give Naruto an edge in his future fights.
Well, he might discover that the sword has some special powers. Maybe it can cut through any material, or it could have the ability to absorb chakra. He could start training with it to become even stronger in battle.
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.
Well, it could lead to him uncovering secrets about his family. Since he is an Uzumaki himself, these scrolls might have information about his parents or ancestors that he never knew before. This could give him a deeper understanding of his heritage and place in the ninja world.
Well, he might use the sword to fight stronger enemies. For example, he could face off against new and powerful Akatsuki members. The sword's power to suppress evil could give him an edge in battles, especially when dealing with opponents who have dark jutsu or are possessed by evil forces.
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.
Well, he might put on the suit and suddenly feel a new sense of confidence. Maybe he uses it to infiltrate an enemy hideout. He could pretend to be a rich merchant or something, and use his ninja skills along with this new disguise to gather intel.
The baby could turn out to have some sort of special chakra. Naruto, being curious and always wanting to help, tries to find out more about it. He might seek help from Kakashi or other experienced ninjas.
It's possible that the tomb contains the remains of a powerful shinobi from the past. Naruto could learn about their history and the secrets of their power. For example, if it was an Uzumaki ancestor, he might find out more about his own clan's abilities. This could lead to him unlocking new forms of his chakra or even new ways to use the Nine - Tails' power.