Is there a method to foolproof LR and RC that would be conducive to improvement?

I do really detailed Blind Review and analysis/review (after checking the answer choices) of all the LR and RC questions (including watching the majority of JY's video explanations), but when I solve a new PT I find that my score isn't increasing and that it has plateaued? So, I am not quite sure if continuing to solve new PTs and comprehensively reviewing them afterwards is sufficient, or if taking more time to re-review some of the LR questions/RC passages that I've struggled with in the past would be helpful (even if that means not being able to take as many PTs)? (I'm currently taking 1 PT/week).

Any help would be appreciated, thank you!