DA means Domain authority is given by Moz seo score. The more authority blogs point towards your website, the more DA will increase. You can increase Domain authority by Guest posts, linking to quality sites and traffic from high authority blogs. But don’t build links quickly and suddenly stop them. Do link your blog in a normal ratio by time. Suppose, this month you have 50 backlinks, the next month, stopped them. Never do that, Google will detect as spam if you are in hurry. Make backlinks which looks like natural.