To date, I have only resubmitted one rejected image, which was uploaded within Lightroom at 72 dpi and a whopping 85"x125" in size. Lightroom probably accepted it since it was still within range of the required megapixels. Fixing the issue was simple enough and I resubmitted it immediately.
I have other rejected images that I may consider re-editing at some point, but I prefer to let some time pass before doing so. I have other, new material to work on in the meantime, so I don't stress over rejected images all that much. If they start to affect my acceptance to rejection ratio substantially enough to be concerned, then I may give my rejections a little more attention if I feel they can actually be fixed. The majority of my rejections happened when I first started submitting to Adobe Stock and they really aren't worth bothering with at all. They're just plain bad. 🙂
Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.