I did get consistently better throughout the year, so I doubt I have plateaued yet.
This coming season should be the true litmus test of where I (or the car (less liking)) start underperforming.
The thing I'm doing wrong is still choppy, autox like inputs. Late apex is good, but that doesn't mean wait until the last second to dump your steering input all at once. A higher level technique would be to blend your inputs, then blend more and more. I blend, just not enough on every corner.