Talk to your advisors! There's no telling, they may have good advice... Make sure your (other) letter writers know what you have accomplished.
When preparing your job market paper, it will help if your abstract and intro make it easy to start to understand what you have done: junior recruiting committees have to look at lots of papers before deciding which papers and candidates to concentrate on.
Prepare for your interview. Starting now, seek out opportunities to talk about your job market paper. (Offer to listen to your friends' elevator pitches, and engage them in discussions about their work, and let them do the same for you.) Talk to your advisors about how to present your work. Practice. Also practice with non-economists: your significant other, your grandma, uber drivers...that may help you figure out how to explain the importance of your work, and not just the content.
Interviews will often begin with the invitation "Tell us about your job market paper," and so you should be prepared to talk without interruption for different intervals: 1 minute, 5, 10, and then be prepared to answer questions. Because they may go to questions at any time, make your first sentences count. Rehearse them.
Be confident: you know more about your work than they do. And be respectful: they know a lot too.
When you are at an interview, remember that someone on the junior recruiting committee already is rooting for you; that's why you got the interview. Now you have to help them convince their colleagues to invite you to a flyout. So be prepared to talk about more than just your jmp: it's their interview, and they may have questions for which they need answers before they can take the next step. So listen carefully to their questions, and try to give real answers, and not just steer the conversation back to the points you were prepared to make.
With any luck, interviewing will be fun. It's a chance to meet people who really want to hear about your work. (When you arrive as a new hire, they may be more interested in telling you about their work:)