I use auctions infrequently but have recently listed a few items which are traditionally sold by booksellers and are not books.
The results have been underwhelming even by today's Ebay standards.
Fortunately, I was not depending on those sales.
A recent drop in online sales would coincide with the recent increase in negative news in press channels of all ilks. And that will affect both Ebay and Amazon.
I do not think that lowering prices will help, and auctions are a way of lowering prices on the modern Ebay.
Listing more has historically been the best way I have gotten out of a slump. Fresh to market inventory seems to sell better. But unless you find some great inventory, trying to buy your way out of a slump is too dangerous and expensive.
I looked at your listings, and I cannot define who the buyer who would want some of your very nice books could be.
If I were to advise on what to look for in your existing inventory which might turn quickly, I would usually recommend books which are paid for with OPM (other people's money). Given the chaos on many campuses, university libraries are not likely to buy the thesis fodder that doctoral students request, and corporations being asked to reimburse work related books. Such titles were in the past immune to external influence.
