One idea could be that Naruto discovers he has these new abilities during a dangerous mission. He uses the Ice Release to freeze enemies in their tracks and the Wood Release to create barriers or even grow trees to hide behind. Maybe he has to learn to control these powers from an ancient sage who knew about these rare releases.
Well, perhaps Naruto's Ice and Wood Release are the result of a hidden bloodline that gets activated accidentally. In the fanfiction, he could use the Ice Release to make ice sculptures that come to life and fight for him, while the Wood Release is used to heal the land that has been damaged by battles. It would be a story of Naruto exploring his new powers and using them for the good of the village.
One idea could be a story where the main character discovers a new form of Wood Release that has unique powers, like the ability to heal entire forests. This could lead to a conflict as others try to control or steal this power.
One possible fanfic could be where Naruto discovers he has Wood Release through some ancient hidden jutsu. He might struggle at first to control it, like how he did with the Nine - Tails' chakra. Maybe he gets some help from Yamato who also has Wood Release experience.
Well, a really cool plot might be that Naruto, in his search for more power to protect the village, stumbles upon an ancient scroll that details a nuclear - release type of power. However, this power is extremely dangerous and he has to train in a secret location away from the village. Along the way, he meets a hermit who once tried to master this power and was scarred by it. Naruto then has to decide if he should continue to pursue this power or abandon it for the safety of everyone. This would lead to a lot of character development and internal struggle for Naruto.
One plot idea could be that Naruto discovers the Keyblade while on a strange new mission outside of the Hidden Leaf. He initially has no idea how to use it but through trial and error, he starts to unlock its powers. Another idea is that the Keyblade is a gift from a mysterious sage who believes Naruto has the potential to use it to save both the Naruto world and the world connected to the Keyblade. Maybe Naruto has to use the Keyblade to fight against an enemy that can manipulate time and space, which is a new and dangerous threat to his village and friends.
Another plot could be that the Sharingan is given to Naruto as a last - ditch effort to save the village. A dying Uchiha gives Naruto his Sharingan, and Naruto has to figure out how to incorporate it into his already powerful set of skills. He might have to deal with the jealousy or suspicion of some of his comrades who are wary of the Sharingan's power.
A third plot idea is that Naruto is given the Rinnegan as a last resort to save the ninja world. An old sage or some kind of divine being bestows it upon him. But with the Rinnegan comes a prophecy that he will either save or destroy the world. Naruto then has to battle his inner demons as well as external foes, all while trying to understand the true nature of the Rinnegan and its place in his destiny.
One plot idea could be Naruto constantly falling asleep during important ninja missions. His friends initially think he's being lazy or irresponsible, but then they discover it's a medical condition. They start to adapt their strategies to protect him when he's asleep and also find ways to manage his narcolepsy so he can still contribute to the team.
Perhaps Naruto is on a mission in a strange new land where guns are the common weapon. He gets his hands on a couple of guns and has to quickly learn how to use them to survive. His chakra abilities combined with the guns' power make him a unique and formidable fighter in that land. His friends back in the village are initially skeptical when they hear about it, but then they see how effective he can be.
One interesting plot could be a character with shadow release power being able to manipulate the shadows of ancient beasts. This would create a whole new level of challenges and adventures as they try to control these powerful and unpredictable forces.
One idea could be a story where a new character discovers a unique chemical release ability that no one has seen before. They could use it to solve a mystery in the Naruto world, like finding out who is secretly poisoning the water supply in a village. Another plot could involve a villain using a chemical release jutsu to create a dangerous fog that makes everyone hallucinate and fight each other. Then Naruto and his friends have to find a way to counter it.