The services listed here may offer assistance or consultation in publicity, public relations, promotion, advertising, and/or branding. These terms each have their own meanings, but they all may factor into your marketing plan. For the sake of simplicity, I listed them under the general heading "Marketing Services." (And yes, I know that, technically, book tour services, reviewers, and interviewers could fit under this heading, too.) Check each listing to determine what part(s) of the marketing process they specialize in.
Audiobookworm Promotions (advertising, etc.)
Henry Roi PR (advertising, promotion, etc.)
Jeniffer Thompson (author branding, design, and website services)https://jenifferthompson.com/
Lola's Blog Tours (marketing and online presence feedback)
Modern Library (promotion)