Improving the Domain Authority (DA) of a website, especially from 0 to 20 in just 30 days, requires a focused strategy. For your website, dofollowguestposting.com, which implies guest posting and link-building, here is a plan to quickly boost DA:

1. Quality Content:
   • Before you even think about outreach, ensure your website has high-quality, original content. This increases the chances of other sites linking back to you organically.
   • Create cornerstone articles—long-form, in-depth articles about core topics relevant to your website’s niche.
2. Mobile Optimization:
   • Google’s indexing is mobile-first. Ensure your website is mobile-friendly, with fast loading speeds and an intuitive design.
3. Optimize On-Page SEO:
   • Work on meta tags, headers, alt text, and content keyword optimization.
   • Make sure the website has a clear URL structure, a sitemap, and is easily crawlable by search engines.
4. Backlinks:
   • Given the nature of your site, you might already be in the process of guest posting. Ensure these are high-quality websites with a good DA themselves.
   • Prioritize relevancy; getting a link from a related niche website is often more valuable than an off-topic high DA site.
   • Avoid black-hat SEO tactics like buying links, as these can result in penalties.
5. Internal Linking:
   • Ensure that your articles reference and link to each other where relevant. This not only helps in reducing bounce rate but also in spreading link juice throughout your site.
6. Regularly Update Content:
   • Frequently updated content can be a signal of a site’s relevancy. Ensure that you not only publish new articles but also occasionally update older ones.
     
     Also read: DofollowGuestPosting.com Provides Free Dofollow Backlinks Opportunities to the First 100 Articles
     
7. Social Signals:
   • Share your content on social media platforms, and encourage others to do the same.
   • Engagement (likes, shares, comments) can act as indirect signals of content quality.
8. Build Relationships:
   • Engage with bloggers, influencers, and website owners in your niche. This could be through comments, social media, or direct outreach.
   • A genuine relationship can lead to quality backlink opportunities in the future.
9. Remove Bad Links:
   • Regularly audit your backlink profile. If you find links from spammy or unrelated sites, consider using Google’s Disavow tool.
10. Increase User Engagement:

• Work on improving metrics like bounce rate, page views per session, and average session duration. The more engaged users are, the more trust search engines place in your website.

11. HTTPS:

• If your site isn’t already, make it secure by moving to HTTPS. Google has explicitly stated that HTTPS is a ranking factor.

12. Submit Your Website to Directories:

• Submitting your website to relevant directories can help in gaining authoritative backlinks.

Remember, while the above steps can help increase your DA in 30 days, genuine, long-term growth comes from consistently following best practices and focusing on providing value to your visitors. Domain Authority is also a metric developed by Moz, and while it correlates with a website’s ability to rank in Google, it’s not a direct ranking factor. Always focus on the broader picture of overall SEO and user experience.