Well, Naruto might rely on his other senses more. His sense of smell, which is already quite sharp, could be enhanced further. He could also use his chakra to sense the environment around him, like how he can detect the presence of others. And he'd probably train with his friends more, especially those like Hinata who can guide him using her Byakugan.
He would adapt by training intensively. He could learn from blind ninja techniques if there are any in the Naruto universe. Maybe he'd develop a new form of jutsu that doesn't require sight but uses sound or vibration. Also, his friends would surely help him. Sasuke, for example, might share some of his knowledge about perception to assist Naruto in his new state.
Naruto would first go through a period of struggle and frustration. But being Naruto, he wouldn't give up. He'd start by learning to move around his familiar places without bumping into things. He'd work on his hearing, trying to distinguish different sounds and their sources. His relationship with his friends would change too. They'd become more protective, but Naruto would still want to be independent. He might also start to train with his summons, like Gamabunta, in a new way that doesn't rely on sight.
Perhaps he was in a battle against a very strong enemy. The enemy might have used a special attack that specifically targeted his eyes, like a genjutsu that damaged his optic nerves when he broke free from it.
Naruto would need to train harder to make up for the lack of an arm. He could develop new jutsus or modify existing ones. Maybe he would start using more wind - based attacks that can be controlled with just one arm and his chakra control. Also, his friends might help him by creating prosthetics or assisting him in battles.
He might rely more on his other senses like hearing and smell. Just like real - world blind people can develop enhanced other senses, Naruto could use his chakra to sense the environment more acutely.
Well, Naruto could also turn to his friends for help. In the Naruto universe, teamwork is highly emphasized. His friends like Sasuke, Sakura, and others have their own unique abilities. They could cover for Naruto's lack of chakra and together they could come up with strategies to fight opponents. Maybe Sasuke could use his Sharingan and ninjutsu skills, while Sakura could use her medical and combat skills to support the group.
He might start by training his aim constantly. Just like how he trained to be a ninja, he'd practice shooting at targets day in and day out.
Well, Naruto might first be really confused. He's used to being a boy, so suddenly being a girl would be a huge shock. He might start by trying to understand the physical differences. For example, getting used to different clothing styles. And in terms of his relationships, his friends like Sasuke might react in a strange way at first. But Naruto being Naruto, he'd probably still be as determined as ever. He could use this new form to his advantage in some situations, like using his new appearance to deceive enemies. After all, he has always been adaptable.
Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.
Well, it could be due to a powerful enemy attack during a fight in Wave. Maybe an enemy with a sharp weapon or some dangerous jutsu managed to strike Naruto's eye.
He might become more withdrawn. Without his happiness, Naruto would lose his usual exuberance. He would probably start to isolate himself from others, as he no longer has that positive energy to share. For example, he might stop going to his favorite ramen place and avoid his friends.
Naruto could become bitter. Losing trust, especially in those he once held dear, can make him view the world in a more negative light. He may no longer believe in the good of people so easily and might be more cynical. For example, he might not be as quick to offer help or friendship as he used to be.