Since this isn’t focused on concrete timelines (like studying for the LARE), perhaps you can incentivize your reading?
If it is a text with more words than images, you can set a goal for each chapter. Perhaps one a week, so you can digest?
Set aside a block of reading time that you schedule formally like for appointments and then do it!
I incentivized myself by using an app called Habitica. It’s structured like a little video game where you make a little character Adventurer that get points rewarded for doing what you actually say you want to do and you lose points if you neglect to do your habit/task per day. As you accumulate points you ‘Level Up’. You can even join groups that would hold you accountable if you need the extra boost. It’s good for establish flossing and exercise habits, quitting smoking, and studying.