Ok, crazy idea time. Context: https://www.livescience.com/65441-gravitational-wave-memory.html
Quick lay summary: Apparently gravitational waves alter the structure of the space they pass through.
So here's the crazy idea: Inside a galaxy, lots of stuff is moving all the time, and gravitational waves are going to be coming from all sorts of local places. However, between galaxies, where matter is not there, matter is not passing through space at the planck scale often. What if the gravitational waves passing through the structure of space stretch it, but matter moving through the area and for lack of a better way of saying it, realigns it.
What if this mechanism is the underlying cause of inflation