Genshin Impact Becomes Reality, and I'm Fontaine's Biggest Star

Looking for a New Cosplay-Template Novel, Preferably Featuring Honkai: Star Rail, Genshin Impact, and Honkai Impact 3rd

I want something like "Honkai: Star Rail, but My Cheat Lets Me Transform into a Honkai Valkyrie". There are already way too many stories about national destiny and rule-based horror games. I'd prefer one where the characters cosplay in the real world. I hope an author will come up with something new, or at least write more stories where a System lets the protagonist transform directly. Being able to turn into multiple forms would be great, of course.