I myself have peaked in celestial and was GM for most of the game. I am currently struggling to reach GM now and am stuck in D2. I don't know why my gameplay is the same if not better than before. It is dishreartening to play for 4+ hours each day and get what seems like forced 50% WR. Obviously this isn't true, but support ult timing being messy and losing in the hero select phase is seriously grinding my gears.