i have a friend who is great at this, so i picked her brain a bit. she does this method and i see her booking show after show without a social media presence. she does 90% studying the brief, 8 percent presenting her submission in a structured way (think: explain the idea, what lead up to it, how it will benefit the show, who she is, and even visualises how it will look by photoshopping her art into their space) and 2% submitting beautiful work.