One radius drawn from the Watterson buys clicks in a state you may not be licensed for
Radius targeting around a Louisville office spills across the Ohio River within a few miles, and every one of those clicks is either a real opportunity or a wasted one depending on your license.
Draw the map by hand instead. Target the counties and cities you serve by name: Jefferson County, then Oldham and Bullitt if you go that far out, then Clark County and Floyd County only if you are set up to take Indiana work. Requirements differ by state and are worth confirming with the relevant agency or your own counsel before you turn the geography on.
Check the location setting itself. Platforms will show ads to people merely interested in a place, which in a metro with a heavy relocation flow means somebody in another state reading about Jeffersontown. Sometimes that is exactly your buyer, an owner who moved for work and kept the house. Sometimes it is noise. Decide deliberately rather than by default.
Add exclusions for the places you decline. If you do not run doors past the Gene Snyder or out into Shelby County, exclude them and stop paying to say no.
Keep a separate note of what each geography produces. A campaign that looks fine at the account level often turns out to be one county carrying the rest.