Well, perhaps in this fanfiction, Sinbad's world is in a state of chaos and the people believe that only the legendary hero Sinbad can save them. However, Naruto is the one who is brought to this world instead. He has to convince the people that he can be their savior. Naruto uses his training as a ninja to form a group of allies similar to his ninja team in his own world. They go on quests, battle powerful foes, and Naruto slowly changes the way things are done in Sinbad's world by introducing some of his ninja values like loyalty and hard work, all while trying to find a way back to his own world.
The plot could involve a magical spell that merges Naruto's essence with Sinbad. Naruto, now in Sinbad's body, has to navigate Sinbad's life while also dealing with his own ninja instincts. He might use his knowledge of chakra to enhance Sinbad's magic and together they embark on a journey to discover the source of a dark magic that is corrupting their land. Along the way, Naruto's friends from his own world might also be drawn into this new world, adding more complexity to the story.
One possible plot could be that Naruto somehow gets transported to Sinbad's world. He might start off as an outcast due to his different appearance and powers. But as he shows his ninja skills and strong will, he gradually gains respect. He could then team up with Sinbad to fight against a common enemy that threatens both their worlds.