I am a copywriter who does what they do best: writing words that will sell your product. I'm not good at much else, but I specialize in this one thing.
I love to write the phrases that make people giddy with delight and purchase items without hesitation. They say you should be able to describe yourself in one sentence, so here it is: "I'm a copywriter who does what they do best: writing words that will sell your product."