Short story: The question is self-explanatory
Long story: I play the piano and I know how to read scores, and I always struggle a little bit to learn new pieces of my level because my reading is very bad. One day I was watching some random video on YouTube about studying piano, and the teacher, in order to provide an example, casually sight-read a short piece masterfully and I was amazed and I wanted to be able to do that!
Then, I realized that I had never actually practiced reading before, and that if I were able to sight read, I would discover a whole new world.
So I took a couple of books below my level and sight read them. It was far from good, but I felt a little improvement throughout the process, and it was fun too. Though, when I got back to a piece above my level, like Chopin's Scherzo No.1, I still read like a child.
I don't feel like this "method" was very efficient, because I feel like I would need to do this with 100 more books, and I don't have that much, and I can't repeat the ones that I have indefinitely because I would eventually memorize stuff, and it wouldn't be sight reading anymore.
This made me wonder, are there exercises or techniques to help this process? Or should I just sight read stuff until I can do it decently?
I found come correlated (and helpful) questions here, but they provide only general advice.