To increase domain authority (DA), start with building a strong SEO foundation. Use relevant keywords, optimize title tags, meta descriptions, and URLs, and ensure your content is valuable and user-focused. Speed matters—optimize images and enable caching to improve page load times. Secure your site with HTTPS, and make sure it’s mobile-friendly. The real game-changer is backlinks—focus on getting high-quality backlinks from authoritative and niche-relevant websites. Avoid spammy links at all costs. Internal linking is another powerful yet underused strategy—it helps distribute page authority. Update old content and maintain consistency in publishing.