Simple but tricky question

I have a very big comp, with many overkill sized comps in it and a camera hovering over the main comp. My solution is to scale down all the internal comps to reasonable size and if it’s not sharp then just collapse them.

How could I scale those comps down along with all the content , animations, adjustment layers etc inside, and the scale them up to end up the same dimensions?

I usually do it manually for one or two but I would need some trick here