What if you can't improve on something? What if, despite tinkering, testing and trying nothing results in something better than what you have already produced? Is this success or failure?
(I am tempted to leave the above questions alone, here to think about. The exploring is where we discover. The practicing and searching to improve is where new ideas can begin to form or connect or die. So while improvement does not happen something else does. A new direction is spotted.
This first set of ideas is picturesque and hopefully some of it is achievable. My other thoughts are we get lost trying to improve when we have already achieved the peak. We don't see the greatness because we are looking for greater. To be charming, we don't see the view or even realize we have reached the top of the mountain because our heads are in the clouds.
But there is a third, and probably more outlooks. What if we could accept we have achieved great? What if getting to great was accepted and it became part of our process? We could free up the mental and physical space needed to try and re-think and apply the efforts to other ideas and processes. It's actually great to have foundations, and building blocks and staples to rely upon. They allow us to create and explore. Sure, it's important to test out the strength of these elements now and again. But it is also okay to let them stay in place if they remain solid and true.)