Do Some Engaging Yourself
It's critical to engage with other accounts, which may seem counter-intuitive to your goal, but social media is full of musicians self-promoting their projects. You don't want to get lost in that shadow.
Try to start making connections. This goes beyond just mass-liking tweets on your time-line or favoriting every Instagram post you see.
Take the time to provide thoughtful comments; you can even display your music preferences and expertise in your comments.
In addition to this, always engage when someone responds to one of your tweets or posts. Show that you care and you value other people's opinions on your music.