You only have 3 types of clients
The first group is clients you’ve had and lost. If you’ve lost clients, for whatever reason, there’s no real value in trying to win them back. Most businesses would be best to remember the ‘three attempts’ rule. You should make two attempts to win back clients you think you have lost. Then you should make contact with them a third time to make sure you’ve lost them. For example, the third attempt could be a call to let them know that it would be in their interest to see one of your competitors. No matter how you do it, it is wise to make three genuine attempts at winning clients back. If you fail, then forget them. Spend your time on somebody more profitable.