You could write a fanfic about Naruto's son, Boruto, going back in time to the era of the original Naruto series. He could interact with his father as a young ninja and see the struggles he went through first - hand. This would create interesting scenarios where Boruto could use his future knowledge to help or accidentally mess things up.
Firstly, know your characters well. Naruto is full of complex characters with unique personalities and backstories. For instance, Sasuke has his revenge - driven past which greatly influences his actions. When writing, keep these traits in mind. Also, don't be afraid to add your own twists to the Naruto universe. Maybe create a new jutsu that combines elements in an unexpected way.
One idea could be a fanfic that focuses on the untold adventures of Naruto's parents, Minato and Kushina. It could explore their relationship, their time as ninja in Konoha before Naruto was born, and how their actions and decisions shaped the future of the village.
One idea could be a story from the perspective of a minor character in the Twilight series, like a werewolf from a different pack who has an encounter with the Cullens. It could explore how they view the vampires and their relationships in Forks.
A 'help wanted fanfic' is a type of fan - created story. It often involves a situation where characters are in need of help in the fictional world. For example, in a superhero fanfic, the city might be in chaos and the superhero is 'help wanted' to save the day. It can be really exciting as it allows fans to explore different scenarios and character developments based on the original source material.
One idea could be a fanfic where Naruto discovers a hidden ninja village that has a completely different set of jutsus. He decides to learn from them to bring new skills back to Konoha. This could lead to new friendships and rivalries within the new village as Naruto tries to prove himself.
One idea could be Naruto with a new, more mature and refined look. He could have a different style of clothing, perhaps something more regal to match his status as a hero. Another idea is a new look based on a different culture within the Naruto world, like dressing in the style of the Sand Village.
You could write a fanfic in which a new game is introduced in the Naruto universe. This game has special powers as prizes. Naruto and his comrades compete in this game, but there's a dark plot behind it by an old enemy trying to disrupt the village through the game's chaos. The fanfic could explore their journey to expose the plot and win fairly.
Maybe the 'naruto new eyes fanfic' could revolve around a character who is born with these new eyes but doesn't know how to control them at first. As they go through various challenges in the Naruto world, like battles and making alliances, they gradually learn to master their new eye power. For example, they might be able to use it to see through illusions that are even more powerful than those usually created in the Naruto universe.
Maybe the new Hokage is faced with a crisis within the village. For example, there is a rift between different ninja clans, and the Hokage has to use his/her diplomatic skills to bring peace. They could start by holding clan meetings and listening to each clan's concerns.
One idea could be a story where a young ninja discovers they have the Lava Release ability but it's a rare and feared power in their village. They have to struggle to control it while also facing discrimination from other villagers. As they grow, they meet Naruto who helps them see the potential of their power for good.