Any “subscription limit reached” error is due to your Velappity subscription settings.
For example, if your Velappity license has expired, you will receive this message when trying to take any action on the site, and you should contact Pulsion to extend your subscription.
If you have bought an asset bundle of 500 assets and try to add a 501st asset, you will receive this message, and should contact Pulsion to purchase more assets. This also applies to number of users and number of forms.