Where did they go?
Some have moved out of town.
Some have died.
Some simply don’t need what you are selling.
Some have found an alternative.
It’s the last one that should concern you the most.
You need to find out what that alternative is and why it became an alternative for your customers.
You also need to find out why you are losing customers.
No matter how many new customers you have coming in your front door, if you can keep them from going out the back door, you should see your profits increase.
Now go do your homework.