Be deliberate
Reading through the backlog of James Clear's 3-2-1 newsletter and came across this:
“Create your life rather than live it.”
To me this reads simply as "be deliberate." Don't just let yourself drown in mundane routine. Let each act be, as much as possible, a step towards the life you want for yourself
This can be a difficult thing to do but as is the case with most things, starting one step at a time, little by little, can be immensely helpful. Another way to interpret this quote might be to ask yourself "what actions can I consistently take to create the life I want for myself".
Part of this is also introspection to, that is, being able to sit down with yourself and probe for what you really want out of life.