I had issues with fall off as well post payment. Not a lot of return customers, especially when the summer season ended. I found that providing free knowledge content really helps drive customer engagement and retention. Something as simple as weekly emails on... say advice on the optimal usage of their sprinklers will be percieved as free value and they will always have you top of mind for lawn and garden care. Even if they decide to call and ask you a question. You have a warmed lead and can say, well I have a service that provides that and it cost $X. Even if you don't have that service yet, the skill sets of the employees are transferable. Hope this helps!!