I have done all 3 phases of Athlete 20XX! What's next?
We recommend you start again from the beginning (phase 1). By repeating Athlete 20XX over and over again, you will build layers to your athletic performance and physique. Athlete 20XX is a system that never grows old.
You can take breaks every now and then to do something else but returning back to Athlete 20XX will always be a good idea.
Also, just finishing the weeks is not necessarily a sign of mastery! Your form and execution should match the demonstrations. If not, then you have some more work to do!