Use Tools like Ahrefs, Buzzsumo, or guest blog directories like MyBlogGuest and Guestpost.com. They help you discover relevant websites accepting guest posts, often categorized by niche and traffic.
Search Google with “write for us” or “guest post” combined with your niche keywords. Use tools like Ahrefs or SEMrush to see where your rivals are guest posting, then chart your own course.
Monitor industry forums, Facebook groups, and Twitter hashtags like #guestpost or #writeforus. Hidden gems and opportunities await amidst the online chatter.