I better understood now, why I have hard time to switch my job now. I am working at high visibility projects in a very big company: cloud computing, SDN/NFV, et

I better understood now, why I have hard time to switch my job now. I am working at high visibility projects in a very big company: cloud computing, SDN/NFV, etc. I have a master degree in engineering and a MBA from fairly reputable universities. I had my professional engineer licenses in 10+ states before (I have not keep up with annual fee). And, I received 20+ some patents on wireless and devices for my company. But, I feel I am under used and under paid. The things they want me to do is too easy. My working life is easy for me, and I want to do battle. So, I am training myself with by finishing on 2-3 Coursea classes per year (math, ML, SNA,..), attending workshops and Meetups in the valley. I worked 10-12 per day for many years now. It works, I have fair knowledge on new areas and hands on development skill now. I get average 2-3 Linkedin head hunter requests per month for link or discussion job opportunities. I turned most of them down, because some of them too narrow scoped and I also do not want to embarrass myself: I gave my links/phone number to some, but they never call me back. I will be 69 years old in few months. It took me a little efforts to get here. No problem, I will create my own battle ground. I am not done yet.