Welcome, KenH! Gulf Coast? Lovely area. We stayed at the Gulf Coast State Park every year back when it was still mostly in ruins - but it was enough for us - now the prices have driven us to Ft. Morgan, which we like very well anyway.
Anyway, I find this a tough question as well. I’m tempted to make ours a 2 night minimum, but then I remember some delightful people we met on one-night stays! Also, being in DC, I can’t imagine having nearly the number of bookings if I had a 4 or more night minimum. Lots for foreign guests are coming through and doing NYC-DC-then Miami or other such location, or heading out west. Personally I like shorter stays - company, like fish, tends to stink after 3 days! ; ) Our guests share our home so they make an impact.
The other snag about taking short stays is that they can book in the middle of a 4 day opening and then you’re much less likely to get those days booked.
So, if you know that, personally you prefer the longer stays, and you’re not in financial need to the point you have to sacrifice what you want, stick with that. Or, change your minimum nights and see how it goes - if you start to fill up better, then you can choose to stay and it works out, you can keep it that way. Conversely if you start getting bookings that chop up your calendar, you can change it back. Personally I’ve blocked off everything after September for this very reason - I’m not sure if airbnb will continue to work for our family and if I want to set minimums, invest in making the space a separate apartment, etc. I can afford to give myself some time to learn before committing beyond the summer.