The only thing we have any real influence over in the world is our own thought, feeling, and behavior patterns. So yes, I would say that making choices about that tiny little world is the most important thing we can be doing as agents. Everything else is secondary.
Wanted to share two articles published in mainstream media, namely Ohio newspapers, about how rationality-informed strategies help people improve their lives.
This one is about improving one's thinking, feeling, and behavior patterns overall, and especially one's highest-order goals, presented as "meaning and purpose."
This one is about using rationality to deal with mental illness, and specifically highlights the strategy of "in what world do I want to live?"
I know about these two articles because I was personally involved in their publication as part of my broader project of spreading rationality widely. What other articles are there that others know about?