Decide which side of the water your pages are actually for
Serving the whole metro on paper and serving it in practice are two different businesses, and your site has to pick one.
The Howard Frankland, the Gandy and the Courtney Campbell carry almost everything moving between Hillsborough and Pinellas. A trip that looks like fifteen minutes on a map can be a great deal longer at four in the afternoon. Patients learn that faster than marketers do.
A South Tampa office can certainly treat someone from Clearwater. The real question is whether that person will make the crossing twice a year for hygiene, come back for a seat appointment on a Tuesday, and show up for the follow-up after that. Most will not.
Build coverage outward from the county you are in. Neighborhood and procedure pages for your own side, written with detail only a local would have. A page aimed at the other side of the bay needs a reason behind it: a second location, a provider patients follow, or a case big enough that the drive stops mattering.
Getting this wrong is expensive in a quiet way. You spend months on pages that never rank, and the few that do bring inquiries that book once, discover the drive, and cancel. Nobody records that as an SEO failure. It is one.