The head terms are expensive for a reason that will not change
Renewing premium makes a customer worth years of revenue, and the largest bidders have priced accordingly.
A policyholder retained produces commission or premium annually, which means the lifetime value supports acquisition costs that look absurd against a single transaction.
Direct writers have built their economics around that and advertise at national scale. Comparison platforms bid too, because they can sell the same contact to several agencies.
An independent agency bidding on the same personal lines terms is therefore competing against both a larger balance sheet and a business model that monetizes the click more than once.
That is not a management problem to be solved with better targeting. It is the shape of the auction, and the correct response is to compete elsewhere.
Where general benchmarks are quoted for this industry, they usually describe those large advertisers rather than a local agency, which makes them worse than useless as a target.