This is my problem as well. I'm tried using millionshort, obscure duckduckgo searches that exclude a lot of the big sites, and they still don't show up.

Those who wonder how these niche sites looked like, and example: http://www.mir.com.my/rb/photography/ This site has an immense amount of data in a reading-friendly format about old, obscure, beautiful photography equipment, in a way I've not seen for decades. Why? Because it hasn't been updated since 2005. And it just works.