Yesterday was awful for me too. I'm always doooog-tired on a Friday night. Couldn't convince myself to play and kept looking at the time.
Eventually I dialled back the tempo MUCH further back than I normally practise and I added my own groove to it. Didn't hate that and it got me tapping my foot and enjoying it again. Slowly increased the tempo until I got to my current practising speed.
This duel has been incredibly useful for learning how to focus my practise. I figure this is the "right" way to do things. Pick one thing and hammer it dead. Make sure you have fun in-between but don't go off learning something else. Deadlines are great too.
Hopefully this is the start of many a "chops building" challenge / duel!