I have reached the last level

We'll soon be adding different programs to our workouts cycles, however, each level can be repeated regardless of fitness level.

The difference will be in the complexity of the exercises.  If you tend to switch out exercises because you can't perform them perfectly, then you should not move to the next level.

If you're done, you can go back to any workout and change the intensity by adding more reps or increasing the speed at which you perform the exercise. BUT it must be in good form so you prevent injury.