People buy inside a window - a stretch of time where they're actually open to it.
For brand new clients, the window is speed - how fast you get back to them.
For clients who've already paid you, the window is follow-up - how often and when.
Here's how you find yours: look at your past clients. Who came back on their own, without being asked? How long did they take? That's your window.
For some businesses, it's every two weeks. For others, it's seasonal - every spring or the start of the school year. Don't guess. The data's already in your client list.