There are several different components to being able to read. One of which is comprehension, which is what you are struggling with.

I met the people who created the spell read program, which works directly with issues pertaining to literacy. Digging around, they seem to have sold out to Kaplan, but I also see some online schools which offer the program: https://www.halifaxlearning.com/theprogram. I do not know if this would be affordable to you, but at least back then it was a very effective program.

All the best.