Net Negative Churn
Net negative churn is the increased revenue from existing customers that is greater than the revenue lost from churned customers.
In addition to focusing on adding new customers each month, also make sure you are providing additional opportunities for your customers to upgrade their service in order to increase your MRR/ARR. For instance, this can be accomplished by offering your customers useful product upgrades, such as additional modules, additional licenses, extended support contracts, etc.
I want to hear more about customer referrals