It's actually a really fun game (I have it for my tablet), so I was surprised to see that there weren't many discussions as well.

Kairosoft has a long history and their games are super popular, but since most players started off on mobile, there's a more robust community on reddit (r/Kairosoft). There's a great wiki (https://kairosoft.fandom.com/wiki/Kairosoft_Wiki) and blogs etc, ppl really love KS games, but it's relatively recently that these games started to get PC ports on Steam. All those things probably contribute to the Steam forums being quieter.

I'm really enjoying these games too. I don't really play mobile games anymore and I never played KS games on mobile either, so I'm appreciating the Steam releases.

Edit: Also forgot to mention the Japanese Wiki obviously (https://wikiwiki.jp/kairoparknew/)
Discord server: https://discord.com/invite/DBk8c9PB