I've started creating a profile for one of my pets using pet art I've had for a long time. I want to credit the artist but the problem is that I don't actually KNOW who the artist is for a lot of my pets art anymore! It occured to me that this is, in fact, a wider scale issue. Half the artists that used to be credited on my pet profiles for their pet art have changed accounts or no longer appear to be playing!

I've thought about going around and trying to figure out who they are by posting in a forum but the problem is I don't even remember which images were made by subeta artists and which were made by artists I commissioned elsewhere! How could I go about dealing with this issue?

If you don't know which images were by which artists then I'm not sure there's anything you can do, unfortunately. Iirc you can't use uncredited images