You are not alone!! I am in a similar situation as you and I have been feeling exactly the same way the last few days. Only a year and a half in business so I consider myself pretty new.
Right now I just have one DCG who was reduced to part-time as her mom went on mat leave recently. I had another pt-er that I lost due to moving away.
Very quiet in terms of enquiries and only had 2 interviews since actively advertising since Aug. The "rush" I was hoping for in Sept hasn't materialized yet.
I'm sorry your interviews haven't resulted in filling spots. Have you considered asking these families outright why they went with someone else? That might help identify what is going wrong with your interviews (if indeed it is a problem with you and not them, goes both ways).
I did this with one mom that I interviewed. I didn't feel comfortable asking but I HAD to know. I am glad I did because her response helped me determine what I needed to improve. In my case I failed at selling my daycare with enthusiasm compared to the provider she went with! I wasn't surprised... I HAVEN'T been feeling positive about my daycare lately. It's SO hard trying to find clients.
To keep morale up I have been acquiring new gear at garage sales (cheap), working on presenting my daycare better and just trying to keep hopeful and patient... also looking at other ways I can supplment my income. I don't want to give up and I hope you don't give up either!