If you are into any business, big or small then focusing on how users are discovering you on mobile devices is important. Now mobile search caters to more than 50% of the overall searches being conducted in search engines and with growing reach of smartphone this number can further grow only.
Not that the desktop searches are less important. But you have to give a prominence to how your website is optimized for mobile users and also ensure that you occupy the right sport in mobile search ranking
Here is why Mobile first strategy should be your priority