Some writers have an exceptional ability to use language to convey an idea. Others are brilliant with metaphor. Still others excel at dialogue or description. My strength is truth. Coming from an acting background where I strived to always live truthfully in front of the camera or on stage, I have an innate ability to sense what is true vs.
So many call it your voice, but I call it your THEME! Not the theme of your story, the theme of your life. We all have a unique perspective on the world that is our own and we write from that center. If you can articulate what that is for you--what you fight for every single day you drag your butt out of bed--then you can sell your writing!