The Akatsuki would be highly affected. Since Naruto has future knowledge, he could stop their plans before they even start. Also, his friends like Sasuke would be affected as Naruto could prevent Sasuke from going down the wrong path.
One possible plot could be Naruto using his Rinnegan powers to go back to the time when the Uchiha clan was about to be massacred. He could try to prevent it, which would change the whole future of the ninja world. He might face challenges like convincing the Uchiha not to rebel and dealing with the political powers that were behind the scenes pushing for the massacre.
One possible main plot could be Naruto using his Anbu skills to change the past. Maybe he tries to prevent certain tragedies like the Uchiha massacre. He could secretly influence events, using his knowledge of the future and his combat abilities.
One possible main plot could be that Naruto and Kakashi go back in time to prevent a great disaster. For example, they might aim to stop the Nine - Tailed Fox attack on Konoha that happened in the past. This would involve them having to deal with different versions of their friends and enemies. They would need to be careful not to change too much of the past, as it could have unforeseen consequences on the future they came from.
There's also 'Back to the Beginning: Narusaku Edition'. Here, Naruto's time - travel experience is filled with heart - warming moments between him and Sakura. It shows how Naruto, with his future experiences, can be more confident in his interactions with her. The fanfic does a great job of exploring their relationship development in a different timeline, and the author adds some unique jutsu and battles that are related to Naruto's time - traveling situation.
Naruto's powers, especially his Nine - Tails chakra, could have a huge impact. He could use it to fend off stronger enemies much earlier. Hinata's Byakugan would give her an edge in predicting enemy moves. They could use their powers together to change battles that were originally lost. For example, Naruto could use his Rasengan more effectively with Hinata's support and knowledge from the future.
One possible plotline could be Naruto using his old and experienced self to prevent past tragedies. For example, he might stop the Uchiha massacre. He could use his knowledge of jutsu and his understanding of people to change the course of history and bring about a more peaceful future from the start.
One possible plot twist could be that Dark Naruto tries to change the past to prevent his own dark transformation. He might attempt to save someone important who in the original timeline led him down the dark path. For example, if it was the death of a certain character that made him turn dark, he could go back and try to save that person. This would completely change the future and the Naruto we know from the original story.
One possible main plot twist could be that they go back to a time when the Uchiha clan was not yet massacred. Sasuke might have the chance to prevent it, but this could have unforeseen consequences. For example, it could disrupt the balance of power in the ninja world at that time. Another plot twist could be that they go back to a time when Naruto's parents were alive. Naruto might get to meet them and learn from them directly, which would change his understanding of his own identity and power. A third plot twist could be that they find out that their time - traveling was actually part of a grand scheme by an ancient and powerful enemy, who wants to use their presence in the past to change the future in a way that benefits them.
One possible plotline could be Naruto using his newfound time - traveling ability to prevent some of the major tragedies in the past. For example, he might try to stop the Uchiha massacre. He could also use his knowledge from the future to help his younger self become stronger faster, perhaps by teaching him some advanced jutsu he learned later in life.