@Matthew285, thanks so much for your reply! I had contacted AirBnB help a few days prior to my post here and then all of a sudden, my listings were visible again. A few weeks passed, and despite daily work on my listing, guestbook, adding pictures, etc, they fell back again. I've put in another request to AirBnB help and their answer is to direct me to a webpage with tips (all of which I've followed already) and to suggest that I use more filters in my search. My concern is that out-of-town potential guests are likely not going to use more filters than superhost, IB and # of guests. And even when I use those things, or map, my listings tend to be invisible until I've done about 20 clicks between filters, zooming in on the map, etc. A marketing person would say that the likelihood of a guest finding me and booking goes down the more of those "clicks" and adjustments that have to be made.
I've reached out to AirBnB's help again - sigh - so hopefully whatever buggy thing is going on will be found and adjusted, again.
What confuses me, is that I am a superhost on instant book, with great ratings, competitive pricing, and am doing daily work on the listing and calendar -- so why would AirBnB's algorithm or programming have me cycling back to being less visible after time? My suspicion is that it is because they are trying to keep all listings visible enough to get enough bookings to keep them hanging on, then switching the visibility around --- rather than really having visibility around performance. I'm reconsidering my acceptance of the insinuation that IB, superhost, great ratings, etc would lead to highlighted listings over time. It seems to me that despite consistent effort and performance, my listings cycle in and out of visibility. Consistent visibility is key to getting bookings that make the income for this short term rental come even with that of a long term rental (especially when considering added wear and tear, risk, utilities cost and labor of AirBnB relative to LTR). I've noticed I have to be on top of regularly tracking the visibility of my listings and then being the noisy wheel reaching out to AirBnB help when they go less visible, which means persisting through layers of "customer service" that gives me two messages of "cut n' paste" responses and links to webpages to "help" me before they'll actually look at the issue and see I've followed and done all of those suggestions. Worth noting.