I can relate about wanting to move on after mastering an activity. Sadly, in many cases it doesn't take the fabled 10,000 hours or otherwise becoming an expert. When what you do is in essence the same thing a lot of other people do, when you're not blazing the trail, staleness is reached much more quickly, and with it the need to rock the boat a little. Hm, I wonder why this has been in my mind the last few months...