How can you Improve domain authority?
Below are the ways to improve the Mozrank of your website:

Guest blogging
Write quality content for a guest post because link equity is a give and take process. When you link to other quality websites, you will get high authority mentions.

These do follow/no follow links will help to improve your Moz rank.

Hire an SEO agency
Hiring a reputable SEO agency or SEO professionals will make your site better.

They can get backlinks from websites, build a link building strategy, avoid low-quality links, and fix them to improve the site DA score.