What have I spent 10+ years practising?
Sometimes it takes awhile to see the most obvious thing that has been there throughout our whole journey. We focus so much on the details and not on the bigger picture; hence why I had been stumped on my friend's question. I reflected, dug deeper, and after some serious thought, discovered what the common element was.
I am an expert in coping with transition. Not only had I experienced a lot of transition personally, I counsel individuals and organizations on how to improve (change is a huge element of this).