Another plot could be that they are part of a long - term plan to infiltrate an enemy organization. By hiding their strength, they are able to get closer to the leaders of this organization without arousing suspicion. Once they have all the information they need, they can use their full strength to take down the organization from the inside.
Maybe they hide their strength in order to protect their relationship. They don't want to draw too much attention to themselves as a couple who are also very powerful. So they act normal in the village, but when they are on secret missions for the Hidden Leaf, they show their real capabilities.
Another idea is that Naruto has to hide his strength because he discovers a conspiracy within the village. By feigning weakness, he can gather evidence about those who are plotting against the village without raising suspicion. He might pretend to struggle in normal missions while actually being far more capable.
One interesting plot could be a mission where Naruto, Hinata and Sasuke have to work together. During the mission, Hinata's shy nature starts to break as she has to communicate clearly with both Naruto and Sasuke. Maybe there's a powerful enemy that only their combined skills can defeat. Naruto uses his Rasengan, Sasuke his Chidori, and Hinata her Byakugan - based techniques in a coordinated attack.
One idea could be that during their training, Naruto discovers a new form of chakra control while Hinata helps him by using her Byakugan to analyze his flow. Another could be they train in a secret location filled with ancient ninja challenges that test both their physical and mental strength.
One idea could be Naruto finding out about Hinata being abused and vowing to protect her at all costs. He could train her to be stronger so she can defend herself in the future.
One plot idea could be that Naruto and Hinata are on a mission together. They encounter a powerful enemy who uses a strange jutsu that causes them both to faint. When they wake up, they find themselves in a strange, dream - like realm and have to find a way to escape while also dealing with their feelings for each other.
A plot could revolve around a mysterious threat in the village that only Hinata's Byakugan can detect. Naruto, being eager to protect the village, teams up with her. Along the way, they encounter various challenges and have to rely on each other's skills. Hinata's shy nature starts to fade as she works closely with Naruto, and they grow closer as friends or something more.
Another interesting plot could be that there is a prophecy about a Kitsune - human union (Hinata being part Kitsune and Naruto being human) that will save the ninja world from a new, powerful dark force. They initially don't believe it but as strange events start to unfold, they realize it might be true and must embrace their unique bond to face the threat.
A possible plot could be a story set in an alternate universe. Naruto is not the hero he is in the original story, but Hinata and Tenten believe in his potential. They work together to help Naruto find his true self and his powers. Along the way, they encounter old enemies who are now much more powerful, but through their combined efforts and friendship, they manage to grow stronger and face the challenges.
In a fanfiction, Naruto could manipulate Hinata's social interactions. He might notice that Hinata is often left out or too shy to join in with the other ninjas. So, Naruto starts to engineer group activities where Hinata is included. He could also manipulate how others perceive her by highlighting her strengths and kind nature, which would not only boost her confidence but also change the dynamics within the ninja community.
One plot idea could be that Hinata is captured by a powerful enemy during a mission. Naruto, using his newfound Sage Mode abilities, tracks her down. He battles through hordes of minions, and when he finally reaches Hinata, he has an epic showdown with the main villain to save her. Another could be in a post - war scenario where Hinata is in danger from a hidden threat within the village, and Naruto, with his status as a hero, uncovers the plot and saves her just in time.