I can't directly provide the content of the novel, but I can provide you with some relevant suggestions and inspiration:
1. In the World of Death, the female protagonist may need to learn some spiritual skills to better complete the mission in the Naruto World. He could consider describing in the novel how the female protagonist used spiritual power techniques to sense Uchiha's position and actions, and how to interact and fight with the spot.
2. During the mission, the female protagonist may need to cooperate with others to complete the mission. You can consider describing the interactions and cooperation between the female protagonist and other characters in the novel to better show the character's personality and characteristics.
3. In the Death God World, the female protagonist may encounter some powerful enemies. In the Naruto world, the female protagonist might need to fight some powerful ninjas. He could consider describing in the novel which ninjas the female protagonist had fought with and how the female protagonist dealt with the attacks of these ninjas.
4. The female protagonist may face some challenges and difficulties in the process of completing the mission. He could consider describing how the female protagonist overcame difficulties and challenges in the novel, as well as how the female protagonist grew and improved in the process.
I hope that these suggestions and inspirations can help you create a wonderful novel where the female protagonist transmigrated from the world of Death to the world of Naruto and her mission is to kill Uchiha.
Yes, in many games it is possible to finish side quests like the Carnan quest even after completing the main story. This is often designed to give players more flexibility and to allow them to fully explore the game world and all it has to offer.