Best way to increase Domain Authority?

Buy quality backlinks

You basically need to follow all best practices of both On-Site and Off-Site SEO. This means that you first have to pay attention that your site is optimized well, that it's fast, has good structure and satisfying user experience, and so on. Also, all tags and meta-tags should be included so that everything is set up correctly from a technical perspective. Once you make sure that everything is fine in this area, you can move on to working on the Off-Site aspect and adding high-quality and relevant keywords to the site, implementing external links only from other reliable sources that already have pretty high domain authority and general reputation. Add as many of those links as you can, and eventually, your site will gain decent domain authority.

high DA backlinks + if you have budget for it PPC

You can increase your Domain Authority score by developing high-quality links to your site from other authoritative websites. You can also improve your score by optimizing your website content and structure for better search engine visibility, etc

DeadJoe said:

Acquire high DA backlinks, no other way unless you know someone at moz who would get excited at the thought of you bending over.

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LOL

Masood said:

For improving your DA you should optimize your site with good onpage which include title of pages, tags, images and content itself and choose good domain name that is relevant to your site. Speed of your webpages should be fast. Regularly remove bad and toxic backlinks and create high quality content, publish it regularly. Make sure your site is also mobile friendly.

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Agreed in 2022

Invest in quality backlinks, but be careful when buying because of bad sellers.