Another world (historical/medieval isekai/reincarnation/possession/transmigration etc.)

Vasser transmigrates into her own fantasy novel series (as herself)

Possession as a crow/a character, who wasn't in the "original game" in another world (what was believed to be a game world, but actually was a real world, where the creator there made it into a game to bring in people she needed)

Reincarnation and isekai

Elise was originally born in the world the manhwa is set in, but dies somewhere before her thirties and is then reincarnated in the modern world, where she lives until her mid twenties, only to die once again and now gets reincarnated into her original body at the age of 16 (it's another world; not one from a game or book)

Reinarnation

Transmigration as herself into a world, inspired by a video game she played

Reincarnation and isekai

Transmigration to another world

Transmigration

Isekai and reincarnation