A spate of sudden rejections on a technical basis

I have had good success in having my images accepted by Adobe Stock and recently have run into a spate of Technical Rejectios.  I have carefully re-edited them, taking care to reduce noise, check focus and use the Neural  Artifact Filter in PS to fliter out artifacts caused by jpeg compression.  I have submitted the re-edited versions only to have these also rejected.  Clearly I am suddenly doing something wrong that I had not been doing before - but I am at a loss to know what that wrong thing is.  Any helpful suggestions would be greatly received.  Here are a couple of examples of the rejections I am talking about.