I fully agree with AmandaKDT and the others in that you need to approach things a bit differently. Yes you feel you are offering so much, but perhaps you are offering too much. If someone is less expensive and seems to have it all, it doesn't always add up for a prospective family. I also would not have the animals around the daycare area as guinea pigs are one of those animals that people either love or hate. And def enclose the yard. And maybe move the sleeping area and buy a video monitor so you can still see the ones that are napping but it will not intrude on any children who are awake. I'd also drop the Montessori title. Most people have no idea what that means.
I just opened my own home day care too (back in May) and live in a small townhouse with a tiny yard and not a large play area inside and have taken every meeting as a chance to change if needed. Good luck!