try to build Guest post, submission of High DR and PR website only. After getting good links your website will get automatically good authority.
Getting links from authority sites isn't the one way, perfect On-page optimization, generating unique & quality content on a regular basis, having social media presence & so on can enhance the site's DA & PA.
I have a related question, does it really matter what is the DA of a website? I guess Google doesn't consider the DA while ranking the sites. DA is not a Google stuff so why Google will consider it? As per my understanding, DA is only good for those who offer Guest posting service on their website because usually, clients ask for a high DA site to get a guest post. This is my understanding, anyone can disagree and can give an opinion. It will help me to learn more about online marketing and the importance of DA and PA.
Domain Authority is moz factor. It depends on various factors like site backlinks, content, domain age etc. So make good backlinks for your page first.
create backlinks from high authority websites to increase the domain and page authority. You may also the good content on the website so that others also point to your website.
As high quality backlinks you make will increase you PA/DA as well. So before creating any backlinks check domain PA/DA.
To increase PA And DA 1. maintain content quality 2. increase quality backlink for page and domain 3. user friendly url 4. remove unwanted external links 5. dont be spammer by doing like more internal linking , keyword stuffing. irreleavent content etc
Improve your domain authority step 1 work on your off-page SEO quality step 2 work on your technical SEO step 3 make sure your website is mobile-friendly step 4 improve your page speed step 5 Increase your social signals step 6 Be Patient.