* Write another book. Your best marketing tool in the long run is your backlist.
* Make a Facebook (or the social medium of your choice) page for your brand, and use that to promote yourself instead of your personal page. If you don't have a separate blog, blog there. If you do have a separate blog, post entire blog entries (plus the link to the blog).
* Make an Amazon author page. Keep it updated, and polish it. For readers, this can be a signal indicating whether you're a "real" writer or a dabbler who's uploaded an ebook.