Someone who loses X years of work (stories written, messages sent, memories, etc?) in some fire/computer crash/theft.
But then … that work somehow turns into an actual physical manifestation/world,
They travel into it (Jumanji, Narnia, etc vibes). They travel through the scraps of their own work and memories, trying to recover some things (trying to recover their “masterpiece” they worked on for 20 years?) and answer some big mystery.