Occasionally OPM conducts job fairs throughout the country. The more contacts you make the greater your chances. Don't get lost in the process. Too many job seekers pin all their hopes on one effort. They find an open announcement, send in an application, then forget about the process until they receive a reply.
Federal jobs are highly competitive.
The more jobs you apply for the better your chances. If you're not using a computer program to generate your application or new resume format, before sending in your first application have it duplicated at a local print shop. Then you can send copies to bid on other announcements. Copies are acceptable as long as you have an original signature on the copy you submit. Don't sign the original.