Very simple, if not simplistic: Focus on time, not pages read. Psychologically one can almost subconsciously operate on the notion that information can flow into your brain via proximity to a book.
My goal is to set aside an hour per day for specifically BOOK reading in 2021.
As a Christian my goal is to read my 5 chapters (Psalms, Proverbs, OT, Gospel, other NT) on 71% (5/7) of the days of each month (apart from the above 1 hr).