My background is in digital marketing. Are you measuring your efforts consistently? If not, you should then look at the data to see what's performing and what's not. Then learn, make changes and repeat. You might have more luck looking at how startups market themselves, "lean startup", validated learning, etc. Also, repurposing content for different online mediums so that they are native to the platform works well. However, the artist needs to actively engage with their audience and have conversations.