Life is very much like a box; you can keep taking from it but there comes a time when you have to start putting things back into it or else be faced with an empty box or, to extend the analogy, a possibly less-fulfilled life.
That is where activism and advocacy come into play. Advocacy is a means of putting something back into that box of life by doing something that benefits the many and not just the individual, contrary to the Ayn Rand teachings.
My road to becoming an activist came rather late in life. During my rather lengthy federal career I focused on the many challenging issues I was involved in. These included such issues as addressing the security threat created by moving cargo under bond across the nation, especially in the post 9/11 environment, during my time at U.S. Customs.
It included implementing programs designed to more fully unify the more than 22 disparate entities comprising the newly-created umbrella known as the Department of Homeland Security while serving in that department. It included, while at FEMA post Katrina, estimating the needs and identifying the capabilities and resources at the local, state and federal levels prior to the advent of the next great disaster to, thereby, ensure a more effective response and recovery to avoid what is currently happening in Puerto Rico.
It wasn't until I left federal service that I became much more interested in public policy and community service leading to my becoming much more active in raising my voice to influence that public policy. This, to me, is the very definition of the word activism.