I believe that DA of a site increase when it starts getting backlinks.. I am making links daily for last one month but still DA of my site https://pizzavitals.com/ is not increasing. Some links are indexed too. How can I increase?
Why do you even want to increase the DA for anyway? Not one search engines uses it as a metric to rank websites. But, yes the more links the higher the DA.
Its depend on which types of websites linking you. A backlinks from high DA and reputed website can increase your DA but if you are getting backlinks by commenting, directory submission etc., where already number of links added as external links .... These types of website help you less than other high quality backlinks like links by guest posting and other advanced link building techniques.
You should work more on the off page activities. Update you Blog on Daily Bases. But you should focus on Dofollow Backlink which increase the website DA also.
The DA (domain authority) of your site is roughly proportional to the combined PA (page authority) of the pages, which contain the links to your site. If you want the high DA for your site, then you should place the links to your site on the pages with the high PA, like the start page of the (usa.gov) directory. For now, you place the links to your site on the pages with the low PA, which can not bring the high DA to your site. The combination of (many) zeroes is zero.