Stand out on the crowd by wearing your team outfit
Promoting your club works best when you do it in a manner that doesn't make it feel like you are promoting. Imagine watching random healthy youth wearing a certain t-shirt, the mind starts to wonder what they are about. Just slip your club logo/ your best team and you will stand out in the ocean of crowd. And honestly put, that is promoting done right!
Your club members will always be proud to represent their beloved club, they will gladly promote it everyone asks about it, always in high spirit (as long as you don't antagonize them 😊 ) . Supporting a team? Send them the love they deserve with your own custom jersey matching their flag! Refuse to be an ordinary person! If you love it, be there to show it!