There is no easy way to do this. You'd have to migrate your configuration, your users and your DNS (if you are standing up a separate system).
If you have all your configuration as scripts, that should be easy to migrate, otherwise you need to move things over manually.
You could probably script a retrieve and then add of all the configuration, but there is no 'export all configuration' option.
For your users, you could do a database dump to get the hashes and do a bulk import. Or if you have developer edition you could set up a slow migration using connectors. The user migration process is broadly documented here: https://fusionauth.io/docs/v1/tech/guides/migration/
DNS migration is like any other DNS migration.