Your copywriter is more than a writer. Most copywriters are trained, experienced marketers.
Ask your copywriter what range of services she (or he) offers. Your copywriter will often have a background in print media. Does he handle PR? Many companies spend big dollars on advertising, with varying effect. Your copywriter can create press releases, media kits, media profiles, and can ghost-write articles to lift your media profile.
Ask your copywriter for marketing suggestions. She'll be pleased to offer them.