These forums are the ones you're looking for. Nobody that I know of uses Steam forums, and I forgot they existed until you brought them up. There's a lot of veteran players around here and it's friendly 99% of the time, with the exception of a spammer or obvious troll once in a while.
If you're bored of the game, there's nothing wrong with taking a break (Heck, that's usually what I do between updates), but if you're quitting for good, I'd say you're gonna miss out on a lot of good stuff between now and the game's release. Zombie Massacre is on its way, advanced condo tools, fishing, community condos, and much more...
If you'd just like to see what other people are doing in TU, there's also the Discord:
All I do is lurk mostly, but sometimes it's just fun to see what people are up to.