In the 'naruto denied training fanfiction', perhaps Naruto denies the training because he doesn't trust the person offering it. Naruto has had his fair share of enemies and untrustworthy characters. If the trainer is someone he doesn't know well or has a bad feeling about, he would surely turn down the training. Also, he might be confident in his own self - taught skills and the training he has received from his masters like Jiraiya.
One possible reason could be that Kakashi might think Naruto is not ready yet. Maybe Naruto hasn't mastered some basic skills that are prerequisites for the more advanced training Kakashi has in mind. Another reason could be that Kakashi is worried about Naruto's recklessness. Naruto has a tendency to rush into things without thinking, and Kakashi might fear that this could lead to Naruto getting seriously injured during the training.
Perhaps there are external threats that the village is facing. The leaders might think that Naruto is more valuable in his current position, where he can be used as a front - line fighter. They may believe that promoting him would mean taking him away from the direct combat and strategic roles that he currently excels at, and they can't afford to do that during a time of potential danger.
It could be due to the current situation in the village. There might be threats that required Naruto to stay. Tsunade, as the Hokage, had to consider the overall safety and stability of the village. So, she denied Naruto's request for the training trip to ensure he was available in case of any emergency.
Perhaps he's been influenced by someone who gives him bad advice. For example, if someone tells him that natural talent is enough and training is overrated. Also, he could be dealing with some personal problems, like a conflict within his family or among his friends that takes up all his time and mental energy, causing him to neglect training.
Perhaps he was tired of being pushed in a direction he didn't fully understand. He might have felt that the training was more about someone else's goals rather than his own. He wanted to find his own path to power without following a set training regime.
One possible reason could be that some elders in the village still have doubts about his past. For example, his connection with the Nine - Tails. They might fear that this could lead to instability in the village. Another reason could be political intrigue. There might be other powerful clans or individuals who want the position for themselves and manipulate things behind the scenes to deny Naruto.
Perhaps it's an old enemy who has a change of heart. This enemy could think that by training Naruto, they can make amends for their past wrongs. But Naruto, being cautious, denies the offer as he still has doubts about this former foe's true intentions.
Sure. In this kind of fanfiction, Naruto doesn't go on his training trip. So instead of getting stronger in the ways he did in the original story, he has to stay in the village. He might start to feel left behind as his friends progress. Maybe he tries to train with different people in the village, like the older ninjas who are retired but still have knowledge to share.
Another reason could be that in this fanfiction, the plot is set in a way that there is a new training system in the village. And this system doesn't involve Kakashi in Naruto's training. There could be new mentors or a completely different approach to training young ninjas like Naruto, which excludes Kakashi from the equation.
Perhaps Jiraiya has some personal issues or inner conflicts. He might be dealing with his own past traumas or demons that prevent him from taking on the role of Naruto's trainer. For example, he could be haunted by the failures in his previous relationships or battles, and he feels unfit to train Naruto until he sorts out his own problems.