We have a whatsapp chat currently focused on 40K and 30K. Most people in it are living around Zurich, but a few of us are further away (I recently moved to Geneva).
There is also a discord that has been recently set up to organise game in Zurich.

I'm also looking to find tabletop wargaming players in the west of Switzerland.

For an RPG (DnD) discord server try this:
https://discord.gg/CWdtbraQ
(should be valid for 7 days)