I'm sure you are all familiar with the "Grey Man" term; but for those who are not, please read this very good article, from someone who has been there and done that:
https://survivalblog.com/being-the-gray-man-experiences-from-30-years-in-backwater-countries-by-aps/It is well written and contains some very useful tips and hints on the why and how of being inconspicuous.
This could save your life, someday, or even today in some of our public places.... Read the news and you will see what I'm talking about.
DO NOTE the recommendation on locking everything, everytime, everywhere... and the editors note that this really only keeps honest people honest. Better to have a well hidden cache than an obvious vault for your valuable stuff...