This is a very thought provoking post indeed.
Here’s my two cents worth.
I tend to think that to choose is by itself, an exercise of free will. Circumstance can give you many possibilities and options. And some has a huge influence over you, like a tasty pizza for supper.
But ultimately, you yourself have to choose.
Ps. not to choose is still a decision by itself and therefore, your free will to let life happen.
Cheers!