CampyDuring weekdays I generally only play tf2 when I need to (scrims and matches). I find that this helps me put all my energy and focus into competitive games. It also feels like I am more eager to play tf2 after I've had a busy day or if I am doing something other than sitting at my computer before I have to play. I'd personally recommend not playing much before scrims or matches besides warming up. Hopefully the jungle inferno update can boost your overall interest for the game.
^^^this.
Consider taking a break for a day or two as well, it doesn't seem like much but it can do a world of good. I've burned out in this way quite hard with IRL soccer and just having a few days off was absolutely the best thing I could do to restore my focus and passion.