Naruto might create a jutsu that uses his Uzumaki clan's sealing techniques along with his chakra. Maybe a sealing - Rasengan that can seal an opponent's chakra for a short time. Sasuke could come up with a jutsu that uses the power of the Rinnegan and his own lightning - style chakra to create a super - charged lightning attack that can cut through almost anything.
Naruto could potentially use a new form of the Nine - Tails Chakra Mode. Maybe he combines it with his Sage Mode in a more seamless way than ever before. This would give him enhanced strength, speed, and the ability to sense danger more acutely.
One possible new jutsu could be the 'Force - Nature Manipulation'. Naruto loves nature and is already good at using nature - based chakra. With the force, he could go beyond just using chakra from nature. He could use the force to actually control natural elements like waterfalls, trees, and rocks directly. For example, he could make a whole forest move to his will, trapping his enemies or creating barriers. This would be a very unique and powerful jutsu that combines his ninja skills with the power of the force.
With the Sharingan and Byakugan, Naruto could come up with a new jutsu that involves the Sharingan's ability to predict an opponent's moves and the Byakugan's all - seeing vision. He could create a sort of 'preemptive defense jutsu' where he can sense an attack coming from any direction (thanks to the Byakugan) and then use the Sharingan's prediction to not only dodge but also counter - attack in the most effective way. Additionally, he might develop a jutsu that uses the unique chakra patterns seen by the Byakugan to disrupt an enemy's chakra system while using the Sharingan to keep the enemy locked in a genjutsu - like state, preventing them from escaping the chakra disruption.
He could create a jutsu where he uses the Sharingan to analyze the chakra flow in the ground and then uses Mokuton to grow roots that follow that chakra flow to attack enemies underground. Another jutsu could be to use the Sharingan to copy an enemy's fire - based jutsu and then use Mokuton to create a wooden shield that can resist the heat while also shooting out wooden spikes coated with the copied fire chakra.
Another jutsu Naruto could learn is a defensive one. Given that Kotetsu and Izumo have to protect themselves and others, they might teach Naruto a jutsu that creates a stronger shield or barrier. This would enhance Naruto's survivability in battles, especially against powerful opponents. It could be a jutsu that combines chakra control and some form of elemental manipulation, which Naruto can then adapt to his own style with his large chakra reserves.
Sasuke could be one of the people to teach Naruto new jutsus. They have a friendly rivalry and Sasuke has some unique jutsus like his Rinnegan - related abilities. He could teach Naruto some aspects of the Rinnegan's power, or at least how to counter it more effectively which could be considered a new 'jutsu' in a sense.
Naruto might be able to develop a new jutsu that combines the Kyuubi's chakra with his wind - style jutsus in a unique way. For instance, he could create a tornado - like jutsu with the raw power of the Kyuubi's chakra at its core. He could also potentially develop a jutsu that uses the Kyuubi's chakra to create illusions that are so powerful they seem real.
One possible plot could be that Naruto becomes an all - powerful ninja who uses his knowledge of all jutsus to bring peace to the ninja world. He could travel from village to village, teaching the jutsus to others and uniting the different ninja clans.
Naruto might develop a 'Force - Shadow Clone Jutsu'. He could use the Force to create shadow clones that are more durable and have some Force - related abilities. For example, they could use the Force to sense enemies or even share knowledge between each other more effectively.
Another idea is that Naruto, after the fight, focuses on rebuilding the relationship between himself and Sasuke. He might constantly reach out to Sasuke, inviting him to return to the village. Naruto could be shown trying different ways to convince Sasuke that there is a place for him in Konoha and that they can work together for a better future.