Well, it might show Naruto in a modern setting, all alone, perhaps because he's the only one with his unique abilities. He could be constantly on the run from people who want to study or use him. And as he's alone, he'd have to learn to rely on himself in ways he never had to in the Naruto universe. He'd also likely have internal struggles as he misses his old friends and life.
One possible plot could be Naruto feeling isolated in modern Konoha because he has achieved so much that others see him as untouchable. He might struggle to make real connections. For example, he could be left out of normal social events because people are in awe of him. He might then start to question his place in the village and try to find a new purpose, like mentoring the new generation in a more low - key way.
Well, in such a fanfic, Naruto might focus on mastering a new jutsu. He could be in a secluded area, like the forest near the village. He would practice over and over, facing challenges like controlling his chakra better. Maybe he'd also be thinking about how to become stronger to protect his friends and the village.
One possible plot could be Naruto reflecting on his past Christmases. Maybe he remembers all the times he was alone while others were with their families. He could then decide to go on a self - discovery journey around the village on Christmas day, seeing how others celebrate and finally realizing that he has his own kind of family in his friends, even if they are not physically with him at that moment.
It could be about a character who is lost at sea and has to face various challenges alone, like fighting off sea monsters or surviving a storm.
In a 'naruto fights alone fanfiction', it could be that Naruto is on a mission in a foreign land where he has no support. The local ninjas are all against him for some reason. He has to use his Nine - Tails chakra in a more discreet way as he can't afford to go all - out and draw too much attention. He might befriend some local animals or spirits who help him in a more indirect way, like giving him information about the enemies' weaknesses.
Maybe Naruto is alone because all his friends are with their families. He might be reminiscing about his past Christmases, or perhaps he's on a mission during Christmas and feels a bit lonely while seeing the festive cheer around him.
It could be about Naruto choosing a solitary life after all the battles. Maybe he decides to live alone in the forest to find inner peace away from the chaos of the ninja world.
Naruto might cope by focusing on his goals. He's always been determined, so he could pour all his energy into achieving something in the modern world, like getting an education or mastering a new skill.
Maybe in this fanfiction, Naruto is alone after the war because the villagers still don't fully trust him despite his heroic deeds. He then embarks on a journey to find a new purpose, away from the village that he once fought so hard to protect. Along the way, he discovers new powers within himself and also meets some unlikely allies who help him come to terms with his situation.
Maybe Naruto has had enough of the chaos in the ninja world. He could be tired of all the battles and political intrigue. So, he decides to find a secluded place, perhaps a small island, where he can live in peace and train by himself without any distractions.