Indeed, both Sunbreak and Iceborne have over twice the content and are complete with master rank, which is where the "real" game begins for many of us. Wilds is only the base game and even that is not content complete. There is a huge surge of players with every update, but the content is not quite enough yet so people return to the previous games once they are done, I do the same. When Gogmazios releases next month there will again be a huge player surge which will die down once people are done with it within a couple of weeks. This is the normal MH cycle.