Yes Guest Post is the one way to increase your DA but only if your content is good and the site where you are posting is having good DA and traffic

Guest posting is the best way to create backlinks to increase website DA PA or rank your website on search engines.

One way to improve DA is to choose a good domain name, this is key of success and one of the most important factor.

It is one of the best ways to increase web traffic or it is the best strategy for off-page SEO.

This is one of the techniques that can be used to increase the DA of your website.

Guest posts, forum posts and blog comments are the most important techniques.

Guest blogging is still one of the easiest ways to grow your web traffic over time. By posting high-quality guest posts to various websites in your niche, you will get valuable inbound links, increase your domain authority, and gain extra exposure from intrigued readers. for your content and for building new relationships with bloggers.