As I tell most moms with this question (and it's a big one, isn't it?!), you need to find your niche.
You may decide to work from home. If so, there are many direct-selling or network marketing companies you can join to make money (as I'm sure you'll hear), and if you're willing to put time and effort into it like a real job, you will be rewarded with a real paycheck. I happen to work for one called Ignite, switching electric accounts, and I have been very happy with the business and with the company itself. You can always send me a quick message if you're interested.
I also teach music lessons from home. It's my niche. It's what I have a degree in and it's what I enjoy doing. I make a lot more money teaching lessons from home on my own terms than I would if I went back to work as a band director. Since you have a lot of experience in day care, running an at-home day care may be up your alley. Just be careful to do your research beforehand to make sure you are dotting your i's and crossing your t's. What licenses do you need? Do you need to be CPR and First-Aid certified? What are you required to do as the in-home provider? Is there a limit to the number of children you can take in, either imposed by yourself or by the laws?
In any case, you can probably make a sizeable amount of money doing whatever you're willing to throw yourself headfirst into. The point is sticking it out to make it something that continues to bless your family financially.
I hope you find something that works for you, and if you're interested in an opportunity like Ignite, just let me know and I'll send you the link to a video where you can get all the info.
Take care!