yeah I kind of agree with @Ylva but instead of the phrase “concentrating more” (“concentration” is kind of vague [maybe] ) I think I would use the phrase “practicing more”. Progress and practice have to be slow before they can be fast. I’m not an “expert” (although I have done a lot of research about learning and self-improvement). Read at whatever speed you can and the more you do eventually the better/faster you will become. Sorry that’s not a very “here’s-a-secret-trick!” kind of response. 
I would say using a tracker (a finger or a pencil/pen) is a good idea for forcing your eyes on a target. Do NOT take the advice of a scam artist named Tai Lopez, he is full of BS. I saw him give a talk about how he “speed-reads” and it was utter garbage. (he basically advised people to read the titles and the table of contents and "voila! book finished! "which obviously is idiotic. Read about and research speed-reading. From what I’ve read it’s kind of a myth, but people can strengthen the muscles that control their eye-movement and we can incrementally increase our ability to sustain attention. I highly recommend the books “Tiny Habits” by B.J. Fogg and “Atomic Habits” by James Clear.
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