One possible reason could be that the fanfiction author wants to focus on other characters. Maybe they feel they've explored Naruto's character enough and want to give more spotlight to characters like Sasuke or Sakura. Another reason might be that the plot of the fanfiction takes a turn where Naruto's acting skills are no longer relevant or needed.
The plot could become more straightforward. Without Naruto's acting, there would be less deception and more direct confrontation. For example, if Naruto was previously acting as a double agent, his true identity being revealed earlier would lead to immediate battles or negotiations.
One possible reason could be that the author wants to focus on other characters. Maybe they feel that Naruto's story has been told enough in the fanfic and it's time to give other characters the spotlight.
The story would likely become less comical if Naruto stops acting. His acting often adds a humorous element to the fanfic. Without it, the mood could shift to be more serious.
The story could change in many ways. For one, Naruto's character development might take a different turn. Instead of being so focused on Sasuke, he could become more involved in the political aspects of the village. His relationships with other characters, like Sakura and Kakashi, might also change. Sakura might be disappointed at first, but then she could see Naruto's new perspective. Kakashi could be proud that Naruto is growing up and making his own decisions.
Sakura might be initially confused. She could be thinking about what she did wrong to make Naruto stop talking to her. Since they have been friends for a long time, this sudden change would be very puzzling for her.
One possible reason could be that Naruto has faced so many betrayals and hardships in the fanfiction. For example, if his friends turned on him for some contrived reasons, it might lead him to stop caring. Another reason could be the constant failure in achieving his goals, like protecting the village but always being undermined by political intrigue within the fan - made story.
One possible reason could be that Naruto's character development leads him to focus more on other aspects like his ninja duties or his bond with other friends. As he grows, his priorities shift.
His character development takes a negative turn. Instead of being the optimistic and determined Naruto we know, he becomes apathetic. His once - strong sense of justice fades away.
I'm not sure specifically as there could be many different interpretations of such a fanfic. It might be about Naruto finally dropping a false facade he's been maintaining throughout the story, perhaps related to his strength, his relationships, or his goals.