How can I break my plateau?

I wrote in October and got a 165. Decided I want to wait a cycle and try to improve to a 170+. I’ve currently plateaued around -4 for LR (per section) and -5 for RC. Obviously there’s some variance but those are the averages. My diagnostic was a 153 and I used powerscore to study originally. I still use their Website for drilling/PTs but haven’t found much use in re-reading the books.

I’ve been really focusing on LR and my biggest issue I’ve found is I almost always seem to have the correct answer in my final 2-3 choices, then it falls apart from there. It’s not really a specific question type that I get wrong, it varies on the day/test. I’ve tried blind reviewing but I never really found it to be much help for me personally. What is something I can do to help me break my plateau? I don’t really know where to go from here. Any new books I should get beyond powerscore?

TL;DR Best tips/advice for someone averaging a -4 on LR to improve their score?

Thank you for any help!