A new character could be introduced as the main antagonist. Maybe a powerful ninja from another village who has infiltrated Konoha's politics. This character could be the one behind the idea of forcing Naruto back, with the intention of using Naruto as a pawn in a larger scheme against Konoha.
It could be a new villain who has been plotting against Konoha while Naruto was away.
One possible reason could be a new threat to Konoha that only Naruto has the power to face. For example, a powerful enemy has emerged and the village elders believe Naruto's strength is essential for the village's defense.
Naruto might initially be resistant. He could feel that Konoha is trying to control him again, just like in the past when he was often shunned. If he has found a new life or purpose outside of Konoha, he might not want to give it up easily.
It could be the village elders. They often make decisions for the benefit of the village as they see it. They might think Naruto is needed back in Konoha to deal with potential threats or to boost the morale of the villagers.
Sakura could be one of the main characters. She has a long - standing relationship with Naruto and might play a role in convincing him to return. Maybe she tells him about the state of the village's hospital or how his friends miss him.
Well, one possible plot could be that Naruto is on a very important mission far from Konoha. But due to some political reasons, like the village elders fearing he might defect or get influenced by outside forces, they force him to return. For example, they might spread false rumors about him being in danger or that he's needed urgently for some made - up security reason.
It could be a rogue ninja from within Konoha who has his own reasons for not wanting Naruto back. Maybe this ninja was jealous of Naruto's popularity and power before he left, and now fears that his return will put an end to his own plans for power within the village.
It could be a corrupt elder in Konoha. They might be power - hungry and see Naruto as a threat to their control. So they manipulate the situation to make Naruto the enemy.
Perhaps Kaguya Otsutsuki is resurrected again, but this time with a stronger will and more dangerous plans. Since Naruto was the one who played a major role in defeating her before, she targets him first in this fanfiction.
The main antagonist could be a new character. For example, a powerful ninja from a rival village who has a vendetta against Konoha. This ninja could manipulate Naruto into leaving Konoha by spreading false rumors about the village. Then, he tries to use Naruto's power as an assassin for his own evil plans.