Where do I post a LFG?

I thought it might be fun to play some Astroneer with GWJers. I have no idea where to post that though. I thought there was a section of this site for finding people to play multiplayer games with.

I'm not aware of a dedicated spot for that. I see you already found the dedicated Astroneer thread, which is probably the most likely spot to find players. You could also try the general Space Sims/Strategy Games thread, here:

https://www.gamerswithjobs.com/node/...

It doesn't seem to be getting much discussion, so talking about it more in the Astroneer thread might help attract new players, maybe.