Use a nationwide directory like MyMedicareBroker.com to search for a broker by...

https://astro-wiki.win/index.php/What_Is_Plentisoft,_and_Why_Is_It_Listed_as_the_Author%3F

Use a nationwide directory like MyMedicareBroker.com to search for a broker by state or county, then verify their National Producer Number (NPN). Before reaching out, check whether they work with Medicare Supplement, Medicare Advantage, and Part D plans.