How do I market myself as a professional speaker?

Marketing yourself as a professional speaker is like promoting and selling any other business service or product.  You need to develop a marketing plan that clearly identifies your customer and their buying motives.  In another way, think about your answer to this question: What problem do you solve for your customer?  Once this is understood you can then start to position yourself as a person who can help others overcome a specific problem or challenge.

Then it is a matter of choosing your marketing channels in order to generate a sufficient number of leads and having a system in place to convert these leads into sales. 

The 12 Steps to Marketing Yourself as a Professional Speaker:
1. Create Your Brand
2. Create Your Keynote Presentation
3. Create Your Speaker's Kit
4. Create your Website
5. Get Calling
6. Get Networking
7. Get Online
8. Get Referrals
9. Publish a Blog
10. Publish Articles
11. Publish a Book
11. Publish a Course

The key thing is not to wait for someone to promote you, promoting yourself is an ongoing task and takes time.  Remember that most event organisers have their speakers confirmed for months in advance so you need to put a lot of work in for at least 3 months and then continue this effort over time to keep yourself busy.