Yes?

You can also shout into the void yourself. Eventually somebody might notice and reply.

You can watch the local or federated timelines and if someone says something interesting you can follow them and reply. Or you if you get linked from elsewhere to a good post you can follow the author. Or you can see a list of popular hashtags (or look up a hashtag) and see posts in them, or post to them.

What else is there supposed to be to do there?