One possible reason could be that he has become jaded after facing so many hardships in his life. He might have seen too much pain and loss, which has made him numb and less caring in the fictional scenarios of fanfiction.
Perhaps he has simply become too busy with other aspects of his life. If he has a new job, is studying intensively, or has more social obligations, he may not have the time or mental energy to engage with fanfiction like he used to. Fanfiction often requires a certain amount of time to read and get into, and if his schedule is packed, it's easy to let it go.
It might have a minor impact. If Harry was an active member of the community, his departure could mean one less reader and commentator. But overall, the community is large and diverse, so it may not be a huge deal.
It could be a result of a deal with a powerful and mysterious being. Naruto, in his quest to protect the village, makes a deal where he sacrifices part of his own essence. In return, he is given the power of the Hoshigaki, which slowly transforms him. He then has to figure out how to use this new power without losing his true self.
One possible reason could be a major ideological difference that has grown over time. Maybe Sasuke has adopted a more extreme view on protecting the village or avenging his clan that Naruto can't support. Another reason might be a misunderstanding that has festered. For example, if Sasuke was misinformed about Naruto's actions and intentions and has cut off ties because of it.
Perhaps Kabuto wants to use Naruto as a pawn in his own schemes. He might think that by reviving Naruto, he can control the situation in the shinobi world to his advantage.
It could be that Tora is attracted to the unique characters in Naruto fanfiction. There are so many different personalities and powers that might be appealing to a cat's curious nature.
Another reason could be related to Kakashi's past actions. If there are some secrets or things Kakashi did in the past that come to light and Naruto doesn't like them, he could snap at Kakashi. Naruto has a strong sense of justice and loyalty, so if he feels betrayed or misled by Kakashi, his reaction could be to snap.
It could mean that in the Naruto fanfiction universe, the Kyuubi (Nine - Tailed Fox) has some sort of emotional investment or interest in the stories being written about Naruto. Maybe the fanfictions explore aspects of their relationship in new and interesting ways that the Kyuubi, in the context of these fictional tales, is somehow aware of or involved in.
One common scenario is when Naruto is in a life - threatening battle. Sakura will be on the sidelines, worried sick and using her medical skills to the fullest to keep Naruto alive. She might even put herself in danger to reach Naruto if he's in a precarious position on the battlefield.
Since it's a Naruto fanfiction, it might deal with themes of disillusionment. In the Naruto world, characters often face hardships and betrayals. The 'no longer in autumn' could symbolize a departure from a once - idyllic or nostalgic state. It could also touch on themes of self - discovery as the character's heart changes, perhaps realizing new aspects of themselves or their place in the Naruto world.