Go to the communities page for your instance, set it to all, and scroll through the first several pages adding anything that sounds interesting. Don’t worry if there are duplicates, sub them all. The search for any favorite topics and add those communities, too. Then browse by subscribed»new going forward.

You can also check out [email protected] for communities still getting off the ground.

Oh! And when linking, do it like I did above; this link works no matter what instance you’re on.