I can only advise you to rename and classify the fan art you download (and then repost). It will allow you to better identify and follow your favourite artists when they post something, and most of all help you navigate through your files and perhaps locate a render you want to see again (or repost) at any given point. That's what I do anyway. It's just a few micro-seconds work each time I download, for precious benefits in the long run.
My system is "NAME OF ARTIST" 0x-xxx, e.g. SYNERGY_ 01-05.
The 01-xxx serie is for oneshots. Anything from 02-xxx onwards is for render series, to keep everything nice and tidy, in case the artist pauses a certain story, then goes back to it.
Most of all you say you do create art yourself. If that's the case you really need to state clearly what is what when you either post your own original art, or repost others. Otherwise its impossible for people like me to give you a like for work you actually created yourself.
I understand by rereading your post that is what you do from now on. But another advice would then be to repost only the art you have a source for, or in fact go back and check the name of the artists for all the art you don't have the source for. Yeah it sounds crazy, but for the reasons stated above, in the long run it pays off.
Just sayin'.