The most important thing with conventions is to actually MEET editors and youtubers so they know you for the next months.
I haven't attended a convention in the last months and really feel a difference with the game's launch right now.
Early access release (PAX + Gamescom) > posts on every major websites like destructoid, rock paper shotgun, gamespot, younameit.
Full release 2 days ago (out of money for conventions for months) > I got to contact sites one by one to tell them I still kind of exist.
My two cents : )