Just building onto what @neurooooo said. I am actually using PREP (if I get into it) as my second year off. Since I've graduated in May 2018, I've been a researcher at Albert Einstein College of Medicine. The best thing about my current position is that I've built enough confidence and trust with my PI that she has been willing to throw me into my own project, on top of helping out with post-docs and her student. In addition, if you seen CVs of many PhD students (at least in the biomedical sciences) most of them have had some type of research assistant/technician job after undergraduate because it really helps them build their portfolio and also skillset.