Have you thought about writing the history of the private library of an author? Perhaps your library has a writer’s collection in its archives that would make a good subject.
In “Lost Memory: Reconstructing Writers’ Libraries”, Achim Hölter discusses the importance of writer libraries, noting that “the library of an author’s choice–as a regular visitor, or, even more so, as its creator and, possibly, owner–forms the material basis for that author’s writing and reading practices, and thus for his/her understanding by posterity” (p. 653).
Fortunately, you can access this book chapter (from The Languages of World Literature published by De Gruyter) at https://www.degruyter.com/document/doi/10.1515/9783110645033-047/html
Consider checking it out if you’re thinking about how to approach writing about a writer’s library.