In certain 'naruto hero of war fanfiction' stories, a great plotline is Naruto being sent to a different dimension or realm during the war. There, he has to adapt to new rules and powers. He might meet different versions of his friends or enemies. This forces him to grow in new ways and bring back knowledge or power from that realm to help in the war back in his own world. He also might have to form new alliances in this strange place which adds a whole new layer of complexity to the story.
Well, in some 'naruto hero of war fanfiction', there might be a plotline where Naruto has to make difficult moral choices during the war. For example, he might have to decide whether to sacrifice a small group to save a larger number of people. Also, there could be a story where Naruto uncovers a conspiracy within his own village that is related to the war, and he has to deal with that while still fighting the external threat.