It may feel counter-intuitive to hire a writer when you are a writer yourself. But hiring out the business of writing leaves you free to focus on the craft of writing.
finish, polish, and maintain your author website. You should have up-to-date, organized, professional, and easy-to-navigate pages for your customers. This should include basic SEO as well as an email capture form.
edit, proofread, and/or post your blog content, with photos, alt-text, and keywords. Drafting a blog post is only half the battle; it's all these other things that keep you from actually posting consistently. (But I can ghostwrite for you, too.)
write, proofread, and distribute your newsletter to all those people who have given you their email address.
handle any word-related tasks that keep you from your actual writing project.