I mainly read success, motivation and financial books. Books that interest me and that I can learn something to implement in life - an idea or shortcut or solve a problem.
Once you read a book that helps you in your life, your believe changes and you now know good books can give you knowledge/shortcuts/ideas/methods etc. that authors have taken years to uncover. Don't you want to gain that valuable knowledge in few weeks reading? Don't you want to save time solving problems quicker to be a better you?
Once you know the benefits, don't you think that will motivate you?
Also some books are boring. Skip those. Find those that are interesting with stories and real life experiences. Those capture my attention the most. Books written by authority figures or selling well that you can trust the info are some criterias how I choose books.
Lastly books have fillers too so feel free to skip to the juicy interesting parts. You don't have to read cover to cover. Skim, skip the boring chapters! Make the read interesting for you! Why suffer through boring stuff if you don't enjoy, probably don't believe the idea/knowledge to use it anyways. Find interesting ones that capture your attention and that you can use! You will enjoy reading and continue to read.