I'll take another view. First I was offered a few years ago a PD position in Portland which I turned down due to a bigger market gig, it was well into the 6 figure.
The problem has been for quite some time is there is no room for the career mid-level talent. Morning talent can command major money, as can some afternoon drive talent. However the competent but generic air-talent has no place to go. Younger, hungy talent will undercut them from a salary perspective, & the authentic personality types will always be hired over the stock-jock types. Stock-jocks used to do overnights or less critical dayparts. In the past decade with clustering & voice-tracking there is less need for these type of employees.
Quite fankly a lot of people would be better off not getting into radio unless its sheer joy for the job, beacause they lack the needed charisma/personality/attractiveness needed. Years ago it wasn't as important for everyone to be so marketable, the mid day guy was usually the production director, late nights & over-nights were handled by either up & comers or steady pros. Now each live jock is expected to mutli-task and perform on multiple platofrms both in the station & to the public. Shy, unsure of yourself?, better think again about doing radio.
What can you do to improve? Lots of things. Take acting classes, get in shape, dress well, & network with proven winners. Stay away from the bitter journeyman jocks who long ago decided they had to be in the business, but have yet to achieve much success. They have picked radio as a lifestyle, not as a career. Now they complain about making 30k. Its sad but true.