What is the best possible way to increase overall authority of a site?

[Kerry_Watson2]

In three easy actions, you may increase your domain authority.
Get the fundamentals right. First and foremost, ensure that your website is properly configured.
Build a network of high-quality backlinks. High-quality backlinks are king when it comes to domain authority.
Reduce the number of low-quality backlinks. All hyperlinks are not created equal.