Bragging about your strengths is how you teach your competition what to prepare for.

Every advantage you describe becomes something other people can plan around. The move you keep talking about is the move they will be ready for, and the thing nobody knows about still works. There is no cost to keeping it quiet, and the only thing you lose is the small pleasure of being admired for it in advance.

Notice what you tend to announce about yourself, then keep one of those things back for a while. Let people find out during the game, the exam, the shift. Admiration afterwards is better anyway, because by then it is about something that already happened.