Anime Crossover: Have I Become the Savior?

I'm Desperate for Something to Read, Even SS-Rank Books Can't Hold My Interest. Help!

Any Male-Lead Crossover, Roleplay, Secret Identity, or Cosplay Transmigration Stories?

More Bungou Stray Dogs and Jujutsu Kaisen, please. The characters being cosplayed or impersonated can be anyone, as long as it's one of those series. Secret identities, like playing different characters in another world, are fine too. No harem stories! Nothing with too many major flaws! Ideally, the protagonist isn't a girl!

Quick Transmigration Stories That Make Up for Regrets in Various Anime and TV Shows

Completed stories where the villains are irresistible, and the second male lead is irresistible too. (They can be characters from a novel or a comic.)

Looking for Crossover Cosplay Transmigration Stories, Cosplay Isn't Required, Any Pairing Is Fine

I’m more interested in Detective Conan, Bungou Stray Dogs, and Jujutsu Kaisen fanfiction. I’d like recommendations that are longer and better written.

Anime, Anything Popular Is Fine. I'm Desperately Out of Things to Read

Looking for books like *HP: Playing the Romance Game in the Wizarding World*. This one is exactly what I mean. Even though it came out years ago, it's really good, the kind of book you never forget after reading it once. Even years later, it still sticks in your mind. Just like it has for me,