Your best salesperson spends two hours a day on I-285
The person most able to sell the job is the person least able to answer the phone, and inquiries do not wait.
Owner run remodeling companies almost all share the same leak. The owner sells, the owner runs the walkthroughs, and the owner is in a truck between Marietta and Decatur when the inquiries come in. Calls go to voicemail during exactly the hours people call.
Time stamp everything for two weeks before you change anything. When did the inquiry land, when was it first answered, by whom, and what happened. Most owners are surprised, and the number they are surprised by is the response time, not the volume.
Fix the coverage first because it is the cheapest change available. Somebody answers live during business hours, even if that person only qualifies and books. An answering service that takes a message is barely better than voicemail. One that follows your qualifying script and books on your calendar is a different tool entirely.
Then set an internal standard for form fills and hold to it: first attempt within the hour, by phone and by text, during working hours. Text matters here because the caller is often driving too.