In front of each of us is a wave function of possibility: things we could do.

Agency comes from the act of collapsing the wave function of things you could do, to the thing you did do.

If you take a longer-term perspective, you can see that your actual situated wave function is a broader, partially-collapsed wave function based on decisions you made in the past.

A visual: your decisions right this moment are a zipper of possibility. You can steer the zipper through space as you go forward, but behind you is fully zippered into one timeline.