The Domain Authority of any website doesn’t depend on its back-linking alone, there are many other metrics you need to take care which ranking up in Google such as Deep Linking, Link Diversity, Quality Content, Go Social, and obivious your domain age

Increase of Domain Authority of any website is not an easy task. It depends upon many factors like domain age, strong traffic and high rank of a website, backward links are pointing to your website, ensure that your technical SEO is in place, create lots of linkable content,develop strong internal linking, regularly remove toxic backlinks and many more.

It's easy.

Don't do anything that will get your site a Google penalty.

Acquire lots of dofollow backlinks that are stable (you'll have them for many years).

That's pretty much it. No penalties and aged backlinks, longer your site is online with more aged backlinks and no penalties the better.

David

I get emails everyday, with a hotline number for this. I'll pm you the number.

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High quality backlinks from higher domain authority domains will help.

Domain Authority = Google authority or MOZ authority?

To increase your MOZ DA, get as many do-follow backlinks as you can. To increase your Google domain authority, get as many high quality do-follow backlinks as you can from trusted sources.

Thanks for all your replies. I will do all your suggestions.

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Hey, read this - 5 Practical Steps To Improving Your Website

That's from Neil Patel.

I'm sure his steps are worth following if you are aiming to increase your DA without getting any red flags.

When it comes to SEO, Domain Authority has a significant role to play.
There are various ways in which you can increase your DA and these are:
Content Quality:
Keep regularly adding fresh and unique content to your website. The best way to do this is by adding articles or blogs on a regular basis.

Link Building: All the pages of your website need to be impeccable. Strong links is the key. Avoid linking to low quality and irrelevant sites just to increase the number of links.

Improved technical SEO: To increase your DA, your technical SEO needs to be in place. The metatags, titles, site structure, navigation all necessarily have to be excellent before you can expect a higher Domain authority.

This MOZ DA factor does not give you any real value of domain authority. DA can easily be manipulated with pure spam. You can test it out yourself, drive 10k GSA links to it and see how your DA goes up.