Hello friends,

What steps can Increase DA of Website?

1: Choose A Good Domain Name. ...
2: Optimize Your On-Page Content. ...
3: Create Linkable Content. ...
4: Improve Your Internal Linking Structure. ...
5: Remove Bad And Toxic Links. ...
6: Make Sure That Your Website Is Mobile-Friendly.

Work on Your Off Page SEO
Remove bad links from your profile
Make your link profile stronger
On-Page SEO Optimization
Work on Your Technical SEO
Make Sure Your Website is Mobile Friendly

Work on your On page SEO, Off page SEO
Make your website mobile friendly
Remove bad links from your site

There are many factors like on page seo, off page seo, quality link building etc

most important from recent mobile first algorithm  is  "Make Sure That Your Website Is Mobile-Friendly". and proper on page optimization.