Tineye on rare occasions have given me results where others have failed
https://www.tineye.com/You can search the filename and or image hash in a 3rd party 4chan archive and someone might of asked the same question asking for the source in the past where another would of shared it.
Also the source could be in the filename.
Example:
>https://desuarchive.org/_/search/image/Z5MMk1QydcYu8P9zd2oIQA/Additionally, I would like to add that there is nothing wrong with spoonfeeding or putting the source in the filename despite how mad /a/ /qa/ /wsr/ will get if you do.
