How to sell yourself in 30 seconds and leave people wanting more

After studying your resume and LinkedIn profile, write down four bullet points that explain why you're great, said McDonald.

Discuss your work history, background, skills, accomplishments, and goals. Leave out any irrelevant details that take away from your core message.

People love stories, McDonald said, so tell them a story. It also makes it easier for others to remember you later on.

Self-improvement guru Dale Carnegie said in his book, "Public Speaking and Influencing Men in Business", that our minds are essentially "associate machines", which means we remember things better when there's a story or association attached to the subject. In other words, if you want people to remember you, tell them a story and make sure it's good.

You need to be able to explain what you do and who you are in a way that appeals to most people. This means avoiding acronyms or terminology that wouldn't be understood by someone outside of your industry.

Dumbing down complex ideas is a "real art", said McDonald. A good strategy is to imagine explaining what you do to your parents and using a similar formula in your elevator pitch. Crafting your pitch in layman's terms is especially critical for those in accounting, finance, and technology.

After telling your story, the listener needs to be left wanting more. Is your story compelling enough to do this? If not, you need to change your pitch.

While practicing your pitch, you should time yourself to make sure you can tell your story in 30 seconds. If you can't, cut down details and try again.

You need to know what you look like to others while you're telling your story. Are you interesting? Are you believable?

People will come to their own conclusions while listening to you, so make sure you give off a good impression. Relax, act natural, and get comfortable with your story.

After you've got your story down, practice your elevator pitch with friends and colleagues. Ask them to give you feedback. Ask them what you should do to make it better.

Keep practicing and tweaking your pitch until it's natural for you to say aloud and convincing to the listener.