If it's everything, then it's not a factor, which is a part, or aspect, of something greater.
And if it's everything, then it is Absolute, as there is no 'other' to which it can be compared. Being everything, anything that changes within is an illusion, because the overall remains the same. That is The Changeless.
You still haven't explained how it does what it does without knowing what it is doing.
And you give no explanation as to what all this so-called 'interaction' is all about, as if interaction were the goal. The Universe may as well never have come into being; a gyrating stupidity.
No one is saying I have to buy into your view; it's just that I don't., and that's because the 'interaction' you are describing requires intelligence and consciousness, something you deny. As I said before, your view is focused on duality and the Outcome, rather than on the unity and the Source.
You present a scenario of one thing acting upon something else, as you stated. That is division and separation. The view I have presented is undivided. It is only that of The Absolute playing itself as The World.
Interaction is nothing more than seeing the rope as a snake, but continuing to see it as a snake, believing snake to be the reality.
Interaction is an isolated, artificial view of 'this' interacting with 'that', but the reality is that whatever change you perceive is actually a total action of the entire Universe, which ultimately is maya.