One possible reason could be the burden of his past. Naruto has faced a lot of hardships and the memories might be overwhelming him, making him want to be alone. For example, the loss of his master Jiraiya might have left a deep scar, and he might feel that isolating himself is the only way to deal with that pain.
Maybe he feels a sense of guilt. For example, if something bad happened in the village that he blames himself for, even if it wasn't really his fault. He could exile himself as a form of self - punishment. He has always been very hard on himself when it comes to the well - being of the village and his friends.
Perhaps in this fanfiction, Naruto is facing an enemy who can manipulate the forest against him. So, he decides to communicate with the trees to form an alliance. The trees, understanding Naruto's pure heart, agree to help him. Together, they create a strategy to defeat the enemy. Naruto might also learn new techniques from the trees, like how to use the roots as a defense mechanism.
Yes, in some fanfiction, Naruto might be depicted as singing 'Everybody Talks'. Fanfiction often takes creative liberties and can put characters in unexpected situations, like singing a popular song.
The plot could involve Naruto having a philosophical discussion with Danzo. Naruto, with his idealistic views of peace and friendship, might try to sway Danzo from his more ruthless ways. They could talk about power, sacrifice, and what it really means to be a shinobi. Naruto could also demand answers from Danzo about the secrets he's been hiding from the village.
Maybe in the fanfic, Naruto is on a mission to retrieve some important information that Sasori has. When Naruto talks to Sasori, it turns into a battle of wits. Sasori tries to deceive Naruto with false information while Naruto uses his intuition and sharp mind to see through the lies. Along the way, they also discuss their different upbringings and how it shaped their current selves.
In some versions of fanfiction, Naruto might use a new and powerful sealing jutsu that he has either created or learned specifically for this purpose. It could be a jutsu that combines his Uzumaki heritage's sealing knowledge with his own unique chakra control.
One challenge is controlling the amount of natural energy. It's not easy to find the perfect balance. Too much and he could turn into a statue or something similar. Another is that he doesn't have a proper teacher to correct him immediately. He has to rely on his own instincts and the limited knowledge he has about senjutsu.
Jiraiya could still play a role. Even if Naruto is raising himself, Jiraiya might cross paths with him and see his potential. He could offer some sporadic guidance without fully taking Naruto under his wing.