Thanks! Long story short I was just burnt out. I don't think I've ever played any game for an entire year straight! Last week I was going to play given the 18 game change, but I went 1/2 to start and would have deranked if I lost another. I think this weekend I'll probably just play through. We'll see!

Edit: actually, a big part of me playing less is how much more competitive weekday play is. Months ago (before the reward change), you could play fun off-meta decks in Mythic and still do a decent job staying at mythic. Now every game feels like you're matched up against an uber meta deck. As you have guessed, I really like new / off-meta decks, and the change has impacted my enjoyment.