He explained this in "The Truth", but that year after the false grooming allegations killed a lot of the momentum he had been building up for post-face reveal content. I remember somebody was posting a video here a few years back of Dream with a group of other American creators scouting out a venue for content, and then of course there was the MrBeast video where he got Chilean SuperAIDs partway through. So you can see the motivation was there at first, but just quickly died out.
He still seems to be on decent enough terms with the rest of the minecraft creator space, though, so if he really wanted he could just crunch out a dozen or so video collabs over the course of 2-3 months to get himself back into algorithmic relevance.