Hi. Have you been out of work all together or just out of Nursing?
If you have been out of work, then you may want to revamp your old resume. A good place to start is your local library's career section. Afterwards look to employed nursing friends to review your changes.
As for allowing your CCM to expire, do not worry! There are plenty of RN CM jobs that prefer rather than require it at this time. In fact, many will hire RNs without any CM experience, so I doubt you will not be of interest to most.
After your resume is in better shape:
1.) Go through a recruiting agency. I know many CMs who work both FT and PT working through agencies. In fact, I get at least 1 email a week and 1 phone call at work a month from recruiters and I am not advertising an interest in jumping ship at this time, so the demand for you exists!
2.) If you cannot find a job using step 1. then try this: Try going through your current friends and former employers. Let them know of your interest in finding a job. Outside of your current circle try joining a networking website, local nursing organizations, local social organizations/professional organizations, and volunteering to make new friends and connections.