Do not make castling from habit.
(Excuse me for my english. I use google translator and please take into consideration, that I write from the perspective of a player with elo 1700. My observations may not always be correct.)
Most matches contain castling. It could become a habit. A player can get an impression that castling is needed. And that without castling lose. In the next game I chose instead of castling material advantage. That opponent probably did not expect.
Then I tried to defense, but still to move forward. And where it was possible to do an exchange. Eventually I managed to transform a material advantage in the win with a stronger opponent.