Hi Artur, welcome to MR!
I am sure other members here will come up with great recommendations. Unfortunately I can't help you. I'm only answering to show you that you're not alone, that there are other slow readers around.
Sometimes I envy other members here who seem to fly through the books but I learned to accept that this is not me. I become too superficial if I increase my reading speed. And at the moment I'm glad if I can steal one hour each day for reading. I want to enjoy this time, not make it a competition.