Does there exist some forum where I can make reuqests?
Most communities on externally-owned sites don’t allow requesting content, but I assume there’s something somewhere for that purpose. I try to find as much as I can on my own but I need help with something currently so yeah.
You'll have to check on torrent or dl sites that might have the type of content you want (or be more specific here). E.g. I think Audiobookbay has a forum where you can request stuff.