I think the simple (yet, likely daunting or seemingly embarassing) exercise of asking friends or contacts in one's professional network "what guy" you are to them (or what they perceive you to be uniquely knowledgable about) is very helpful and even healthy.
Not only can you get to know how others see you, and what image you currently have, but it can help you self reflect as well.
Highly recommend ed!
thanks for your input and thoughts @fredrikaa :)