Win like you expect to win again. Gloating is what people do when they think it was a fluke.

How someone behaves after a win says what they privately believe about it. A person who expects to be here again has no need to squeeze the moment for everything it holds; the celebration is warm and then it is over. Loud gloating is usually insecurity in costume, a suspicion that this might have been the only one.

Enjoy the result fully and then turn toward what is next without a performance. Say something generous about whoever you beat, and mean it. The habit costs you nothing now and matters enormously the first time you lose.