You are not alone. Passing the tests and getting a full licence is just another step on the learning journey you started when you did your CBT and will not stop for the rest of your riding life. We are always learning no matter how experienced we are.
One of the best things you can do to improve your riding is take a course of post-test training. Here at Inner Circle, we have instructors qualified in Advanced Riding Instruction who can help you develop all the way to passing your RoSPA Advanced Riding test at Gold standard, which is recognised as the highest civilian riding qualification by the Police and others.
For details of our post-test training options, see here.