Give some tips how can I improve on my website's domain authority.
Basically more links......
Here is the link to the full article below https://moz.com/blog/how-do-i-improve-my-domain-authority
Be consistent with link building and also build quality links from relevant websites. Focus on building do-follow links from high DA websites and exclude the websites that are spam. I recommend checking the spam score of the website before submitting links. Good luck