Dont give up yet! there are always plenty of new moms returning to work from mat leave (and i find this is the #1 type of person looking for daycare). If you have been interviewing for 6 months and had zero success, are you sure it is because of too many daycares in the area?
How do the interviews go? Is there anyone you know who currently does daycare in your area that you could ask for an honest opinion on why you could not be getting any charges signed on?
I had plenty of second thoughts when I first started not too long ago, but come next month, I will be full with 5 kids! It picks up quick! Maybe you will see some increase in inquiries come the new school year I bet!
Good Luck and stick with it, you are educated in the field so im sure you will succeed!