You should go to the https://steemit.com/trending/introduceyourself/ part of the site and see how people typically make their introductory post. They usually take a picture with a piece of paper to verify that you're a real person, they also usually tell a story about themselves like how they found Steemit, your experience with cryptocurrency, hobbies, goals, career, where you're from, etc, etc, etc.

Goodluck!