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.
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.
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.
It could be about Naruto coming back to Konoha after a long and dangerous mission. Maybe he has new skills and powers to show off.
One possible reason could be that Naruto is extremely powerful and his skills are needed to protect Konoha from a new and powerful threat. His combat abilities, like his Rasengan and Sage Mode, are crucial for the village's defense.
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.
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.
One possible reason could be that they need his power. Naruto is extremely powerful, and Konoha might be facing a new threat that they believe only Naruto can help deal with. For example, a powerful enemy from outside the village might be on the verge of attacking, and Naruto's combat skills and unique jutsu are crucial for the village's defense.
One possible plot is that there is a breach between the Naruto universe and the Hellsing universe. This causes chaos as demons from Hellsing start to invade Konoha. Naruto, being the hero, tries to figure out how to stop them. Alucard arrives, not entirely as an ally at first. But as they both realize the common threat, they join forces. Naruto learns about the different nature of the enemies from Alucard and adapts his ninja skills accordingly.
Perhaps the fanfiction could focus on Naruto's adjustment to the new environment in Konoha. He'd have to get used to the different training facilities, local customs among the ninja clans, and the overall layout of the village. For example, he might struggle at first to find his way around the various training grounds and meet - up spots for ninja teams. But as he explores, he discovers hidden gems in the village and forms closer bonds with the villagers.
It could also be a sparring session gone wrong. Naruto might be training with the Konoha 12, but his new and powerful techniques are too intense. This causes the others to feel threatened and they end up in a full - on fight. Naruto would then have to control his power and show his friends that he doesn't mean to harm them.