What makes a song sound like country
Country is defined less by one sound than by a few habits working together: a story told in plain words, specific nouns instead of vague feelings, a chorus that lands the main line, and instruments that sound played rather than programmed. A flatbed Ford, a county road and a grandfather's watch do more work in a verse than a paragraph of emotions.
That is why a good prompt names the story first and the style second. Say who the song is about, where it happens and the one line that should come back in the chorus. The generator can then build verses that stay concrete, and the hook lands where country listeners expect it, at the start of the chorus rather than buried in the middle.