Keep the clients you have already won.
The sale is not the end of the job. Repeat clients are what make the sales add up.
I have watched owners celebrate a new client and then lose the thread. Nobody writes down what the client actually bought, who is looking after them, or whether they will buy again. The work drifts. The owner cannot see it happening.
Keeping a client is not a new subject. It is the discipline of knowing which relationships are still alive, and which ones are already gone in all but name.
The practice for keeping a business going is The Horizon Method. The Horizon Method