" I have reached premium billing status within my industry, but seem to be offered to work on relatively repetitive problems that are anything but challenging"

I sometimes get that feeling and I have almost reached premium billing in my specific niche as well. But then I realize that some of thte things that don't seem challenging anymore is because we have become really good at doing it over the years. Thats why you get the big bucks even though it might seem like an easy task. The real issue for me is repetitive work as a consultant.