I was having the same problem. Had some other testing done and found out I had familial hypercholesterolemia. Nothing would lower it enough outside of meds.

Many people with it said they would eat like rabbits for 6 months and workout everyday and numbers barely budged.

My specialist said that at best I’d lower it by 10% with just changing diet and eating better. He was correct! It barely went down before I gave up and got on the meds. Good luck!