Switch to Tin-Eye search.
Yandex reverse image search is currently the only useful reverse image search left that can do fuzzy matching. Like if I reverse image search a picture of a cathedral I took, it'll find other pictures of the same cathedral, even taken from different angles. Google and Bing used to be great, Google's is terrible when you include a human subject in the picture, and Bing is very very inconsistent. I have had times where I reverse image a picture and Bing finds nothing except ones a little bigger in dimension, but then I search using one of the bigger ones and it finds similar pictures like expected. It's literally the same picture, just cropped less, no color filters or watermarks.
It can still be interesting to know when an image was first seen, even if the link is now dead. Also sometimes a page only moved URLs or changed its site structure and the picture somehow didn't get indexed at the new location, so the dead URL still helps in tracking things down (rarely, but still). Sometimes you can find something on the Internet Archive.
Also in my experience Bing has a similar tendency of never letting go of things once it has indexed them, even when the result has been dead for quite a while. On the one hand this can be frustrating, but sometimes having just Bing's image preview is still better than nothing at all.