A Domain Authority is basically a metric to show the number of root domains which link to different pages on your website. Here are the few tips that help you to increase your domain authority.
Deep Linking
Link Diversity
Quality Content
Go Social
Let it Age

Domain authority is primarily based on your site link profile. That means how many authoritative sites are linking to your site.

The only thing you need to do to increase your domain authority is:

1 Get rid of bad links.
2 Gain good links.

Increase number of referring domains => domain authority increased.

Build only QUALITY backlinks and don't forget to add unique content in your website. Do NOT spam and also be sure to wait a couple of years too. Google loves old and authoritive domains!

Domain authority is measure of the power of a domain name.It is based on three factors: Age, Popularity, and Size. If you want to get increase traffic on your site then you can choose high domain authority sites when domain authority size is above 50 then its best for your site.

You may try out building high authority backlinks for your website and also build contents for your website to improve the domain authority.

Why are u interested in DA? It's a useless metric thats capitalising on the lack of PR updates.

I suspect what you are trying to achieve is more traffic. DA. CF, PR, whatever, all these are just the by product of traffic followed by links.

Focus on traffic!

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There is quite a decent infographic here:
http://cdn.searchenginejournal.com/w...nfographic.jpg

Google does not fully define exactly how it measures authority, so everything you read tends to be somebody's best guess.

There are no of factors which contribute towards high domain authority of a website including;

1. Site Optimization (site structure, on-page and off-page Seo)
2. Quality Content
3. Social Signals
4. Quality Backlinks
5. Relationship with influencers in your niche
6. Domain Age