Books are like boats.
Readers swim from one reading to the next, and some boats are more easy to access than others.
(I hear it often: How come my genius novel cannot find any readers? ) For my science fiction novels, I often add lexicons! But there are other ways to lower the bar for your readers, by shorter chapters, for instance, or not crowding too many characters in a scene, etc.
Your writer’s task is paradoxically to help your readers to get on board!
Echoes of a Sunday artist 