Writing a book: How do you use references?
Since it is a book, you need not cite in-text in the same way you would an academic article. Simply transitioning to endnotes (super-script 1,2,3) will make the text immediately more readable. I'm reminded of Steven Pinker's book 'The Blank Slate' that contains many hundreds of citations but the text is not cumbersome due to efficient endnote use.  In that work at least, Pinker puts the majority of 'main idea' endnotes at the end of a paragraph, reserving within-paragraph citations for very specific ideas. While this can at times lead to some ambiguity, it preserves readability.