Perhaps Naruto turns the apartment building into a sort of ninja training facility for the younger generation. He could offer free lodging to those who train hard. Since he owns the building, he has the freedom to do this. It could also attract other ninjas from different villages to come and train there, leading to some interesting cultural exchanges among ninjas.
One possible storyline could be Naruto renovating the apartment building to make it a better place for the villagers to live. He might use his ninja skills to do some unique construction work.
There could also be external threats. Maybe other villains or rival ninja clans see the apartment building as a target. They might try to take it over or destroy it to undermine Naruto's influence in the village. Naruto would then have to use his combat skills and strategic thinking to protect his property.
One possible storyline could be that Naruto discovers a new power or ability that gives him a certain level of authority or influence over Tsunade. For example, he might unlock a special jutsu that can control the actions of others to a limited extent, and this affects Tsunade.
Perhaps it's a community building. Naruto is a very community - oriented person. He could own a building that serves as a place for the villagers to gather, like a community center. There could be a cafeteria, a place for kids to play, and rooms for meetings and celebrations.
He could transform the building into a ninja academy annex. Naruto loves teaching and passing on his knowledge. In this annex, he could offer advanced ninja training, focusing on things he has learned from his own experiences, like dealing with powerful enemies and using the power of friendship and determination.
Another storyline could involve Naruto uncovering a dark secret within his family that led to his disownment. As he digs deeper, he realizes that there were misunderstandings and forces at play that he needs to confront. This could lead to a complex and emotional journey of reconciliation or acceptance of his new situation.
One possible storyline could be Naruto gradually finding his inner strength despite the abuse. He might meet a mentor figure who helps him see his own worth and start to stand up to his family. Another could be that Naruto runs away from home and joins a group that accepts him, and then he returns to face his family with new confidence.
Another idea could be that Naruto discovers some dark family secrets that he can't bear. This could include things like his family being involved in unethical experiments in the past. The shock and disappointment are so great that he loses control and ends up causing harm to his family, though it's a very tragic and complex situation.
Another storyline could involve Naruto's sister being trained more rigorously by the village elders because they see more potential in her. Naruto, feeling neglected, then goes on a self - discovery journey to find his own strength outside the village's traditional training methods. As he grows stronger, his sister realizes the mistake of the elders and tries to make it up to Naruto.
One possible storyline could be that Naruto's wife was killed during a major battle against a new and powerful enemy. This would send Naruto into a deep state of grief and depression, perhaps causing him to question his purpose as a shinobi. He might then embark on a journey to find the true cause of her death and seek revenge.
A possible storyline is that Naruto starts to suspect that there was a darker reason for his parents leaving him. This could lead to a conflict within himself, whether to forgive them or not. He could also meet other orphans in the village and form a sort of support group. They could work together to change the village's perception of orphans. Another idea is that Naruto discovers a secret about his parents that puts him in danger, and he has to fight to protect that secret while also coming to terms with his feelings of abandonment.