It could also be that he has different dreams now. Maybe he discovers other interests outside of being a ninja, such as art or music. After all, as he grows up, his perspective might change. He could realize that there are other ways to contribute to his village and the world without being a ninja, like using his charisma to promote peace through diplomatic means.
One possible reason could be the fear of losing his loved ones. In the original Naruto story, many ninjas sacrifice a lot, including their lives. Naruto might have seen this and decided he doesn't want to put himself in such a position.
Perhaps he's tired of the constant fighting and competition among ninjas. The ninja world is full of rivalries and battles, and Naruto may just want a more peaceful life away from all that chaos. He might long for a simple life where he can focus on things like building friendships and enjoying nature.
One possible reason could be that he has seen the darker side of the ninja world. Maybe he witnessed too much death and destruction during his missions and decided he no longer wanted to be part of it. Another reason might be that he has other dreams that he realizes are more important to him than being a ninja. For example, he could have a passion for art or music that he wants to pursue instead.
One idea could be that Naruto discovers a new passion for art and decides to pursue that instead of being a ninja. He could start by sketching the landscapes he sees during his travels, and eventually move on to more complex paintings. This would lead to him leaving the ninja world behind as he focuses on his newfound love for art.
It might be due to a lack of inspiration. Writing fanfiction requires continuous creativity, and if they ran out of new ideas related to Naruto and the ninja world, they could decide to quit. For example, they might have explored all the character arcs and plotlines they could think of within that context.
Maybe Naruto teams up with some non - ninja characters. Together, they could come up with new ways to solve problems in the village that don't require ninja skills. As a result, he gradually changes the view of the village towards non - ninja activities, which is a significant development in the fanfiction.
One possible reason could be that he gets tired of the constant fighting and bloodshed. He might have seen too many friends get hurt or die, and it just becomes too much for him to bear. Another reason could be that he discovers a new purpose in life outside of being a ninja, like focusing on family or helping the village in a non - combat way.
He might become a simple farmer. Just imagine Naruto living a peaceful life in the outskirts of the village, growing crops and taking care of livestock. It would be a far cry from his ninja adventures, but he could find contentment in the simplicity of nature and the fruits of his own labor.
It could be that Naruto has other creative or intellectual interests. For example, he might be more interested in art or learning about the history of the ninja villages rather than participating in ninja battles. He could find the rigid ninja training and the constant competition unappealing. Also, perhaps he has a different sense of purpose, like wanting to focus on building peace in a non - combat way, which doesn't require being a ninja in the traditional sense.
Naruto might be a storyteller. He has many experiences and a vivid imagination. He could sit in the village square and tell tales of heroism (not necessarily ninja - related) to the children, passing on values like courage and friendship through his stories.
Perhaps Naruto realizes that the ninja system has flaws. He may find that the ranking system, the way missions are assigned, or the competition among ninjas is causing more harm than good. So, he resigns as a protest to try and reform the system from the outside. He could also be tired of the constant battles and wants to focus on his family life. After all, he has a wife and children in the series, and he might want to be there for them more instead of always being away on dangerous missions.
A possible reason could be that Naruto gets tired of all the fighting and death associated with being a ninja. After seeing so many friends and comrades get hurt or die, he might decide that he can't take it anymore and wants a more peaceful life. He might feel that there are other ways to contribute to the village and the world without having to constantly be in battle.