The game isn't ever going to truly "pick back up" - not when the developer pulled it from most digital storefronts due to its inability to provide proper support. There is a group or two that occasionally still plays this together; that's your best (well, only) bet if you want to do multiplayer. The only servers for SH are the ones put up by them, and they usually just keep them up during the short windows of time in which they play.

Apologies, most of the time i have a server running 24/7 but due to a complete change of my network infrastructure that started on last saturday and will last until the coming sunday the server will be sporadically unavailable for hours at a time. But everything should be back to normal next week.

Update: Server should be back to normal again.