Do they have autox schools near you? Those really help you since the instructors will tell you what you are doing wrong. Also though I'm in my 3rd year of autox I always do novice walkthroughs during the course walk. This helps you get a second perspective on the lines to take and makes sure you don't forget your fundamentals.
Lastly I found this
book to be a pretty good help to me and helping me understand car dynamics better. Ive been a much better driver over all after reading it. Good luck!