Before you discount my assertion about the who-what, etc. survey/research aspect... please keep in mind that, imo, it is IMPOSSIBLE to 'increase' the incoming business without FIRST doing the research needed --- like:

A who-what-where-when-why-how survey of their existing + previous customers to find out WHO they are and how to reach more of them.

A who-what-where-when-why-how survey of their existing + previous customers to find out to find out ALL the reasons they bought - from THEIR perspective -- so I could use those appeals in future marketing.

A who-what-where-when-why-how survey of thier existing + previous NON-customers (the people who DIDN'T buy after all) to find out who THEY are and what THEY have in common.

A who-what-where-when-why-how survey of thier existing + previous NON-customers (the people who DIDN'T buy after all) to find out ALL the reasons they DIDN'T buy -- from their perspective -- so I could eliminate those drawbacks in future marketing.

And: reseach what was and was not working in their existing mrktng efforts.

Otherwise you are floundering around in the dark!