Okay, here is something most readers do not practice in their reading.
Grab a book that is over and beyond your present knowledge, a difficult book.
Most people read what they already know! They read what agrees with them, or is just a repeat of their storehouse of knowledge. Their mental library would look more like a specialty bookstore that supplies the same subject, level, and opinion.
Read a book from "the other side", you know, those you disagree with, but have no real idea about the person or their real views.
In other words...read a book that will increase your knowledge, that will teach you something new. You may disagree with the author more than before, but at least it will be based upon knowledge.
Suggestion: Read How to Read a Book, by Mortimer Adler.
There are excellent chapters that teach one how to read any kind of book.
This book should be required reading in all high schools.