To promote a WordPress blog, focus on publishing high-quality, in-depth content while optimizing the blog for search engines through on-page SEO techniques. Grow an email list and use email marketing to promote new blog posts. Leverage social media platforms like Facebook, Instagram, LinkedIn and YouTube to share content and drive traffic back to the blog. Build links through tactics like guest posting, link roundups, and broken link building to improve search engine rankings over time. The key is consistently creating engaging content while utilizing various online marketing channels.