Well, one possibility is that Naruto might be really confused at first. He'd see this different version of himself as a female and might not immediately understand the situation. He could try to figure out how this time - travel happened and what it means for his world. Maybe he'd start to learn about the differences in how female Naruto is treated in this new world compared to his own experience as a male.
Another theme is self - discovery. By going back in time and seeing their past selves, they learn more about who they are and how they've changed. Naruto might realize how much he's grown in terms of his ninja skills and his relationships. They also understand their roles in the grand scheme of things better.
One idea could be that Sarada travels back in time and initially mistakes Naruto for Sasuke. This could lead to some humorous misunderstandings as she tries to interact with him. For example, she might challenge him to a fight thinking he's Sasuke, only to be completely surprised by Naruto's different fighting style and personality.
He'd probably be super surprised. I mean, seeing yourself as the opposite sex is not something that happens every day. He might blurt out something like 'Who are you? You look like me!' and then start to realize the situation. He could be a bit embarrassed too, especially if female Naruto had some different mannerisms or ways of dressing.
Naruto would adapt in several ways. Firstly, he'd use his ninja skills in new ways. For example, his speed and agility could be useful in modern jobs like delivery or security. Socially, he'd be curious about modern relationships and would quickly learn the norms. He'd also adapt to modern education systems if he decided to study, using his eagerness to learn. And he'd be fascinated by modern forms of entertainment like movies and video games.
In some fanfictions, Naruto might go back in time and try to save his parents. He could alter the events that led to their deaths. This would not only change his own life but also have a huge impact on the entire ninja world as his parents were very powerful ninja.
Danzo could still be a major antagonist. Even if Naruto travels back in time, Danzo's thirst for power and his underhanded methods would still pose a threat. Naruto would have to find a way to deal with him without causing too much chaos in the village.
The relationship would become more complex. If Naruto time - travels, he might see Kakashi in a different light, as someone who was once young and inexperienced. Kakashi, on the other hand, would be intrigued by this strange kid with such advanced skills. They could become closer as friends, with Naruto sharing his future experiences and Kakashi guiding Naruto in the past world.
One idea could be Naruto going back in time and preventing the Uchiha massacre. He could use his knowledge of future events to stop Itachi from having to make that tragic choice.
Another thing that could happen is that Naruto would change the relationships in the village. He could start to influence the older generation, like the Third Hokage, at a very young age. He might tell them about the future threats and get them to start preparing earlier, which would change the whole dynamic of the village.