If it is a local show..are you taking callers? If so, are you getting a decent response? It takes more than the same handful of callers day after day.
If there's been little to no marketing, do listeners ever know you exist? How would they find out about the show?
What feature or aspect of the show is most likely to gain new listeners?
Here's my personal disaster story:
About 9 or 10 years ago I was working at a Christian station, and the owner decided he wanted to keep the Christian teaching/preaching blocks and have talk radio too. He thought he'd make a fortune combining the two.
Well, when that combo hit the air after a 22 year run as a solid Christian station, it got..well, interesting. Advertisers that had been with the station 15 to 20 years cancelled. Preachers cancelled. Listeners voted by changing stations - to the real talk station, and a new Christian competitor.
He decided we'd have a local talk show in the morning..run preachers, then a different local talk show..then replay the morning show around 3 in the afternoon..then just sign off..like around 5 or 5:30 in the afternoon.
I left about three months into this experiment of bouncing paychecks, calls of complaint and cancellation and
the fact that producing this morning show was boring me to tears.
I advised the owner that I felt his station was not going to survive that course, and that he should have picked one format OR the other. "Oh, it's going to make a LOT of money," he assured me.
Eight months later that same owner had his manager call me, wanting me to come on board as operations manager. The billing had fallen from $10 to 12k a month to barely $4k and could I fix it. Plus, he had flown into town and heard the morning show himself..thought it was the most boring thing he'd ever heard.
It took 2 years to fix and get the billing back up to $10k. The talk radio folks all had to be let go..all they could do was talk and not a one of them knew how to sell.
When the owner got another bright idea that "would make a LOT of money" I decided it was time for him to handle his own messes..got out intact myself before the ship sank and haven't looked back.
My advice: don't rely on the books so heavily. I think folks look at that and lose their common sense.
Look at your active audience and revenue. Are you making a profit? Engaging your listeners and bringing in new ones?
These kinds of questions will help you determine whether it's working or not.