Naruto might become more empathetic towards Ino. After the war, he's seen so much pain and loss, and he could start to understand Ino's own struggles better. He may become more protective of her, seeing her as an important part of the village he fought so hard to save.
He could meet an old enemy who has also changed after the war. This enemy might now be in a similar situation of being alone and they could form an unexpected bond as they understand each other's isolation.
Naruto could encounter wandering ninjas who have their own stories and reasons for not being part of a village. Some might be outcasts due to their beliefs or powers, and Naruto's interaction with them could lead to either conflict or new friendships. He may also come across some of the shinobi who fought on the opposite side during the war but now have different outlooks on life. Through these meetings, Naruto gets a broader perspective on the ninja world.
In some fanfictions, Naruto becomes more jaded after the war. He has seen so much death and destruction that he loses some of his initial idealism. He might be more cautious in his actions and less quick to trust.
In some fanfictions, Naruto and Hinata start a family right away. They enjoy a peaceful life in Konoha, with Naruto being a great Hokage and Hinata supporting him at home and also taking part in some village activities.
One common theme is rebuilding. After the war, the villages, especially Konoha, need to be rebuilt both physically and socially. Another theme is reconciliation, like Sasuke coming back to Konoha and being accepted again. Healing is also a theme, as the characters have to deal with the mental and physical scars of the war.
One possible reason could be to protect his family. After the war, Naruto might have made many enemies. By faking his death, he could draw the attention of these enemies away from his family, especially his wife and children. His enemies would think he's no longer a threat and stop targeting his loved ones.
Here are some good post-war novels to recommend:
1. Slaughterhouse Five
2. Nine Stories
3. Sophie's Choice
4. No War on the Western Front
5. "Half of the battle is silent."
6. Mrs. Dalloway
7. [Zinc-skinned Baby Soldier]
8. Faint Shadow of the Faraway Mountain
9. Blade
10. Indestructible
11. The Promised Land
12. Yellow Bird
13. The Story of Chinese Chess
14. There are no women in war.
15. See You in Heaven
16. Drifting
17. The Rats Want to Sleep at Night
18. Crazy Like Us
19. Ptsd comic
Please note that these recommendations are based on the search results provided. There may be other excellent novels that have not been mentioned.
Naruto might initially be shocked and feel betrayed. But he would soon gather his strength. He could use his skills to survive in the wild or in a new land. He would probably keep training to get even stronger.
There's a chance that some of his former teammates who have their own insecurities. For example, someone who always felt in Naruto's shadow might be the one to betray him in order to get more recognition for themselves.