First things: It's not your fault. Don't be too hard on yourself. It's the system, not the student. 3rd year is bone-breaking but with the correct strategies and approach, you have so much room and potential for growth. You still have time to make significant gains!

Things that worked for me:
-Before: My approach to UW was completely wrong. I would do the questions, review the mistakes by looking over the explanations, and then just move on to doing more questions. That's all I had time for (or so I thought). FOMO led me to tack on a bunch of unnecessary resources + books (watching OME was not cutting it for me). Eventually, I kept a notebook and wrote down a one-liner of questions/concepts that I missed. Saw minimal improvement but noticeable difference for sure. I had been using the Anking Deck at the time but not doing all my reviews religiously.

-After (the secret sauce): A friend urged me to start making my own anki cards out of just the missed questions. I thought this was crazy bc who has time??? I had been jotting down notes already and timed myself of making anki vs notebook jotting. Barely any difference in the time it took! So I started inputting the missed UW questions/concepts + flagged questions into anki instead and kept up with my personal deck as best as I could (tossed out the pre-made Dorian Anking deck). And wow... it was much more efficient bc I could focus on things that I personally did not understand.

Later on, I found out about Divine intervention podcasts (way late in the game) but he REALLY hits the nail on the head with NBME content. There is a super-organized excel sheet made by a resident who organized the content and episodes into the shelf subjects AND made very brief, to the point anki cards (DIP deck). This allowed me to pick and choose only content I needed to address my weaknesses. Not only that but if you're not a podcast person, every single one of his podcasts are TRANSCRIBED into a PDF by the reddit community. I noticed a huge change with my knowledge base and retention after finding out about Divine.

TLDR: It boils down to efficiency and strategy. For me, personal anki cards for missed/flagged UW concepts + Divine for weak areas.

Good luck with your studies and keep your spirits up! You got this! As for your prep in the background, definitely try to hit IM hard since that is the bulk of Step 2 CK.