In some fanfictions, Naruto protects his friends by using his new and improved jutsu. For example, he might develop a more powerful Rasengan to fend off stronger enemies. He also uses his quick thinking and ability to sense danger, which he has honed over time. His unwavering loyalty drives him to put himself in harm's way without hesitation, always being the first to jump into a fight when his friends are threatened.
Naruto in fanfiction often protects his friends by relying on his growth as a ninja and a person. He has learned from his past experiences and mistakes. So, when his friends are in danger, he can come up with better plans. He may also use his popularity among the people. In some stories, the common folk help him protect his friends because they respect and admire Naruto. His ninja way of never giving up also ensures that he will keep fighting to safeguard his friends no matter how tough the situation is.