At the end of February Google announced that they would be altering mobile search results to significantly rank mobile friendly sites higher. This change is due to go into effect on April 21st and if your site is not mobile friendly before then, you could see a dramatic drop in organic search traffic.
One big area Google is really investing in is making sure that the mobile website is useable by visitors. Using their mobile friendly test tool, Google will recommend design changes to your mobile site to make it more friendly, such as: Links being too close together and thus not click-able by fingers, text that is too small to read and making sure you set the viewport so the browser sizes to the screen size of the device.
If you want to see if your current site is mobile friendly, you can test it here – Test Mobile Friendly
If your site is not mobile friendly then drop us a line and we will see what we can do for you.