Enter cosplay contests/ masquerades, win some awards, get officially noticed (Not just Hall Cosplay Awards)
Befriend con-organizers, head of Guess Relations, (they are the ones who will invite you as a Cosplay Guest)
Participate in panels
Give out Cosplay Cards (Cosplay Contact Cards, Cosplay Business Cards)
Make YouTube videos / vblogs, about your cosplay progress, thoughts on cosplay, etc
Advertise, promote yourself online and offline endlessly
Make excellent costumes, not crappy costumes. Never make crap.
Think about what you and your cosplay brand stand for. Think of some way to differentiate yourself from the thousands of cosplayers out there. (i.e. what makes your brand different)