Three masters
You can focus on serving your existing customer base by keeping your promises, understanding their needs and organically growing your constituency.
You can focus on acquiring another customer base, on making a different promise to a bigger or more attractive group.
Or you can focus on serving your muse, on making the song in your head real, regardless of who wants to hear it.
Worth noting that you can successfully choose among the three, as long as you're consistent in your actions and goals.