If you are already on a shared hosting plan and are not receiving over 100.000 total page views per month, the chances are slim that you really need to make this move. The only reason you would need to upgrade to cloud services hosting is if you have a lot more visitors that are consistently pushing your server resources to their maximum, and want an option that can easily scale, or just want a higher level of security alongside data risk management and recovery. A cloud hosting server will take you far if you go beyond that threshold.