If you are the admin of a server that supports activitypub relays, you can add this relay to your server.
Mastodon
Mastodon admins can add this relay by adding
@config.generate_url(UrlKind::Inbox)in their relay settings.
Pleroma
Pleroma admins can add this relay by adding
@config.generate_url(UrlKind::Actor)to their relay settings (I don't actually know how pleroma handles adding relays, is it still a mix command?).
Others
Consult the documentation for your server. It's likely that it follows either Mastodon or Pleroma's relay formatting.