In order to find out if your clients have more business you need to carefully craft a unique message to each client. Don't bombard them with a form letter asking them nicely for more business. If you craft a message that is
- addresses a need
- asks for a follow up
chances are you will get a response -- and that is what you are looking for. The 10% Rule applies but I am sure you will do better than getting a response from 10% of the people you reach out to, if you follow the 4 attributes described above. Yes it takes more time and effort but isn't more business worth it?