Good news! When you upgrade from the previous package, you will still have all of the features available to you that you had in the original hosting subscription package. You do not need to worry about losing any work that you have done on your site.
You will be able to login to your account the same as you do now, make changes/additions and then apply the changes to your live site by clicking Publish.
To learn more about the packages and various upgrades you can add to your account, please see this page on our website and let us know if you have any further questions: Yola Packages.