Anonymous 06/03/2021 (Thu) 04:57:38 Id: bb2f11 No.84790 del
Given the niche markets and the fact that your book is already available online, your best net would be print on demand.
You can do it yourself, or you can contact websites/publishers specialized in "alternate history" so they reference it. People like Castle Hill / Codoh or Cosmotheism, things like that. It would basically cost them nothing...