mikerastiello, 
Every month about this time I hit my ceiling. I can never get higher than about 75, but usually hover between 71 and 73.
I hit level 83, and 99 (four cubes short of infinite) once. Both minutes before the season reset.
I know my decks are good. I know my snapping game is not.
I’ve been playing since last November. I’m consistently a low-to-mid 70s player no matter what I try.