This is the problem with looking at crossdressing as a hobby in itself. It’s insular. The point of your dressing becomes just to be better at dressing and when you hit that pleateau, where DO you go from there? If you’ve perfected your presentation, then the only thing left to do is live your life.
I hit that stage really early in my dressing. I realized that dressing for its own sake wasn’t what I wanted. I dress to express myself, and so I took that to the Nth degree and got into Drag.
The bottom line is that there isn’t an ultimate goal. There’s no last level or final boss. It’s about expression. Did Picasso say “well, I’m good at painting. Now what?”