Word-of-mouth leads in Minneapolis - what worked for you?

Two small Minneapolis employers told me they are hiring but have not posted yet. I worked as a dental hygienist before this. They like a brief email with a résumé. What do you write in a cold email?

Keep a list of who you contacted and when. It makes follow-ups easy.

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.