Lessons I've learned:
- Being safe when trying to win a won game is a good thing, but don't go completely into a shell. Be more aggressive with trading off those pieces.
- Keep the tactical radar on at all times. Don't get lazy and fail to calculate hard moves in a won game.
- Keep pawns on the board when up material! We all know this, but I didn't follow it like I should have. Those general rules  exist for a reason.