But that makes alienation a purely subjective matter of not noticing what's right in front of us. What would be needed is a gestalt switch to escape some perceptual illusion.

On the contrary, the clash between nonlife and life (or more specifically, objectified nature and subjectively experienced personhood) is real. It's real because nature isn't a harmonious place, contrary to Daoism and the other monistic systems. Nature is internally divided all over the place. Just the fact that there are trillions of planets, each an astronomical distance from each other, is already a mark of nature's wildness and thus of profound disunity.

So I don't think simple naturalism solves the problem of alienation. What's also needed, I think, is enough pantheism to grasp the existential stakes of creativity.