How to make $ as a SAHM

I just went back to work and things are not going well. I've always wanted to be a stay at home mom and I'm looking for ways to bring money in and still stay home with my son. 
Does anyone have ways that actually work to make money while staying home with your child? 
My only other option is requesting to work 4 days a week & not 5. However, I'm already part time and idk how well this would go over. I'm afraid to even ask. My son is cared for in the afternoons Monday-Friday so I can work and I have made my employer aware of this. However, things are changing and idk if I can get care for him all 5 days and I don't want to pay part time rates at a daycare for only 1 afternoon a week. How would I go about asking to go 4 days without getting myself in trouble?
Please be kind in your responses,
I'm really having a hard emotional time with all this.