“Is freedom a human capacity to choose actions? Why?”
Our human freedom does not relate to our actions. Our actions are predetermined by our natural instincts as we are always acting according to our inherently egocentric, subjective “pleasure/pain” software, always choosing states, actions that take us…
“What if we were more than just ourselves, and our individual point of view is not meant to focus on ourselves?”
Our true situation is exactly how you described it.
What we feel our “self” is simply an individual cell within the fully integrated and interdependent “body” of humanity, which integrated humanity is also but a single organ within Nature’s fully integrated, living organism.
And from within that individual cell we feel as ourselves our most important point is our individual observer.
And we can learn to develop, fine-tune this individual observer point to the state, developmental level, that we will fully, tangibly, realistically sense the whole system as our own part, observing it, partnering it from within.