Adding instances to your services?

Hi friends, I managed to get a few services running (Mobilizon, Mastodon, PeerTube etc.), and I'm just now realizing that by default none of these federated networks are subscribed to anything?

I'm going to be the only one using these services so I don't care about moderation or defederation. Is there no "subscribe all" button?

And if not, are there comprehensive lists somewhere I can download and import?

Thanks in advance.