As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.
I would recommend 'Uta's Hidden Affection'. In this fanfiction, the development of the relationship between Uta and the reader is really interesting. It starts with small interactions that gradually build into something deeper. The description of Uta's character is very accurate to his original personality in the source material.
Saya no Uta is a dark and psychological visual novel. It often involves themes of love, madness, and the human psyche. The screencaps from it might give glimpses into its unique art style and the various in - game scenarios that contribute to its overall disturbing yet thought - provoking narrative.
The theme of acceptance is quite common. Fem Luffy often has to be accepted by the other characters in the story. This could be because she's different due to her gender or her slightly different personality traits. Also, the theme of self - discovery is prevalent. As fem Luffy navigates the pirate world, she discovers more about herself, her abilities, and her place in the grand scheme of things.
Another place to check is Wattpad. There are many fanfiction writers on there who write about different pairings, and 'uta x reader' is likely to be among them. Browse through the different categories or use the search function to find what you're looking for.