Perhaps there have been disputes between the fanfiction community and the official Naruto representatives. For example, if the fanfiction community has been misusing or over - exploiting the Naruto character in a way that goes against the spirit of the original work. This could lead to the decision of asking Naruto to be removed from fanfiction.
Perhaps continuous disappointment. If all his efforts to bring peace and unity were constantly thwarted, like his attempts at forging alliances between different ninja clans being undermined time and again. This build - up of frustration might lead him to snap and decide to leave in search of a new way or place where his ideals could be realized.
One reason could be to seek greater power. Maybe they feel that Konoha no longer offers the training or resources they need to reach their full potential. So they decide to leave and explore other places where they can become stronger.
One possible reason could be to seek a new life away from the politics and pressures of Konoha. Maybe they feel restricted by the village's rules and expectations. Another reason might be for a personal adventure. They could be in search of something that Konoha can't offer, like a new type of ninja training or a mysterious power source. Also, it could be related to protecting their family. If they sense some kind of threat to their family within Konoha, they might choose to leave to keep them safe.
One reason could be a mission. Maybe he gets a top - secret mission that requires him to leave the village under Tsunade's leadership without her direct involvement. So he has to leave without much notice.
Maybe it's to protect the village. He could discover a threat that he can only face away from the Leaf Village, to keep the danger from directly reaching his home and loved ones. He leaves as a form of self - sacrifice.
One reason could be a special mission. For example, there might be a threat that only Naruto can help with in Suna. Maybe there's a new type of enemy that has some connection to Suna's unique chakra sources and Naruto's abilities are needed to figure it out.
Maybe they leave because of a conflict within Konoha. There could be political unrest or a group within the village that they don't agree with. They might think that leaving is the only way to avoid getting involved in something they don't believe in or to protect the village from the inside out in their own way.
One possible reason could be to seek new powers. Maybe they feel that Konoha no longer offers the kind of training or opportunities they need to grow stronger. Another reason might be to escape from certain politics or social pressures within the village. For example, Naruto has always been an outcast in some ways, and Ino might be tired of the family business or the way things are done in Konoha.
One possible reason could be to search for a powerful artifact. Maybe there's a rumor about an ancient item that can save the ninja world from a new, unknown threat. Naruto, with his adventurous spirit, convinces Tsunade to leave Konoha and embark on this quest.
One possible reason could be a conflict of power. Naruto has his own set of powers from the Naruto universe, like chakra and jutsus. In Fairy Tail, magic is the main power source. Maybe his powers were seen as a threat or too different, causing the guild to force him out. For example, if his chakra-based attacks were disrupting the magical balance in Fairy Tail's world.