Welcome! I also struggle with focusing on learning anything from reading. When I was younger, I developed something that I have no name for, where I can't remember things I read so I just stopped reading any books for years unless it was for school work .I got a lot of bad grades in school because I couldn't remember anything in the books I was supposed to read/study. Multiple choice questions on tests are the only reason I barely passed my grades lol.
I've noticed lately that I'm slightly better at remembering things I have read in the bible now that God is my main focus in life. I still can't remember stuff like the average person can, but it's a lot better than it was before. Focusing while reading is still a struggle, but while reading the bible I decided that whenever I got distracted that I would backtrack to right before my mind wandered and force myself to read from that point again. It's a slow go, but it seems to be beneficial in terms of remembering things better. I also pray before reading that God will help me remember things and to help me understand His word better while I read, then if my mind wanders while reading, I pray again before starting over and then go on.
Perhaps you should should pray before and during reading the bible like I do. It might be just what you need to start learning from His word.