If there is nobody using your service for more than half a month (at that point they would mostly already be counted for 2 months) almost nobody will ever pay.

If there is nobody using your service for more than half a month (at that point they would mostly already be counted for 2 months) almost nobody will ever pay. What is your day 7, day 30 and/or day90 retention? If is low all you can do is lower costs, which should also be straightforward.