I would have to agree with Gerry and Rashid's assessment of your property and calendar. Your place does look very inviting - Humble is a cute town and you have a spacious house with very flexible booking, low cleaning fee, and events/parties OK, so that would all certainly be attractive to guests. I'm not certain what type of "events" you think people will want to have in your home, but I doubt you'll be pleasantly surprised when the first one goes down. Just my two cents, but you might want to change that rule, unless you are staying in that master bedroom and monitoring the situation.
Also, your calendar is completely blocked so that's probably why you haven't gotten any reservations lately; it doesn't seem like it has anything to do with your 2-night minimum.
We've always had a 2-night booking and we usually book 25 out of 30 nights/month, with the exception of March & April which are kind of a bust. We think it is odd since Spring Break and Fiesta (we're in San Antonio) fall in these months, but we are about 25 minutes from downtown. Our home is a 3x2 and accommodates 6 guests. We don't live there, so our guests get the entire house. We don't allow events, parties, or more than 6 people. The first 4 guests stay for the regular rate and we charge an additional $20/guest per night for guest 5 and 6. We wanted to incentivize the smaller groups and hope that if only 4 people stay, then there's one less bed to wash linen and remake. I decided on 2-night minimum mainly because I don't care to be cleaning that house every single day. Assuming that a group uses all 3 beds and is fairly tidy, it takes me 3.5 hours to flip the house (includes washing all linens and towels, bathrooms, floors, and wiping everything down) for the next group. Most of our guests stay 3-4 nights, but we've had guests stay 2 weeks and up to 28 nights as well. To us, it is cost-prohibitive to have to flip the house every day and we'd rather have no bookings than a different group every night.
So, I think the first step is to fix your calendar and then tweak things as you go. Good luck!