Well, in some fanfictions, Minato might use his powerful jutsu to break through the barriers between the living and the dead and directly reach Naruto. He could also try to influence the people around Naruto to bring him closer to where Minato is, like using his spirit to communicate with Naruto's friends and convince them to help.
They could start by showing him genuine love and acceptance. For example, his father could share all the things he sacrificed for Naruto in the past. His mother could cook his favorite meals, just like she used to dream about when he was a baby. And his friends in the family could show him how much they missed him and how empty the family feels without him.
One consequence could be that it messes with the natural balance of the ninja world. Maybe the cycle of life and death is disrupted, and this causes some strange phenomena to occur, like abnormal weather or chakra imbalances.
She might start by using her knowledge of Naruto's past. Since she is his mother, she knows things about his early life that no one else does. She could use these memories to create an emotional connection with him. Maybe she'll show up in his dreams first, like a hazy memory, and then gradually reveal herself in the real world.
One reason could be that Minato has some unfinished business with Naruto. Maybe he wants to pass on some crucial ninja skills or knowledge that only he can teach. Another reason might be the strong father - son bond. Despite being separated for so long, Minato's love for Naruto is still very deep.
One challenge could be Naruto's own independence. He's been on his own journey for so long that he might be reluctant to give up his newfound freedom. Another challenge could be trust issues. If the family has let him down in the past, it'll be hard for Naruto to believe that they've really changed.
In certain fanfic ideas, Naruto could have made a deal with some sort of otherworldly being. He might have sacrificed something of great value, like a part of his own chakra or a future ability, in exchange for Kushina's life. Another possibility is that he finds a way to reverse the very nature of death by using some unique properties of the tailed beasts' chakra that he has access to.
There are fanfictions that go back to the origin of the Nine - Tailed Fox's presence in the village. It might explore how it was sealed initially and the events that led to it being in Konoha. Such a fanfiction can be really exciting as it dives deep into one of the most important aspects of the Naruto story.
It could be about Naruto coming back to the Hidden Leaf Village after a long and mysterious journey. Maybe he has new powers or knowledge that he uses to protect the village from a new threat.