How is the best way or SEO strategy to Increase Traffic on Mobile Site?

Your site should be responsive, and do SEO in proper way.

Is it possible that all traffic should come from mobiles?

Start from Basic SEO and responsive website.

make your site responsive...

If you getting a traffic from organic or it is paid. Responsive design always gives your good ROI.

Use xml file and user enrich java script for user enhanced experience on mobile

Of Course SEO, SMO help you.Make sure your site responsive and add it on call to action button so user can directly contact to you.

basic seo & responsive website and also check website speed

Basic SEO and Mobile freindly website

Start from Basic SEO and responsive website.