I think a new room atop the hospital in start would be a good location for an Era-Go building as start is usually packed.
Nowadays there aren't that many incentives to use the forums, there are a few contests here and there but not everyone knows how to make GFX and these tournaments aren't hosted that much so maybe the admins can frequently host different contests that anyone can win and earn some nice prizes.
This would incentivise checking forums and participating in them. Other than that I don't really know what else we can do as the game doesn't change that much so a lot of the sections in the forum aren't used that often to discuss changes.
Maybe we could start the discussions ourselves? Don't know how effective that would be though.