How can I turn on holiday creator features in my server without uploading a new world?

The Aternos forums are now deprecated

Learn more about this change here.

For help regarding Aternos, we recommend you to visit our support center.

    I have already started on my server, and I want to add the Origins+ addon to the server, but it requires Holiday Creator Features. Is there any way to turn this on in the server without uploading a new world? I don't want to lose the progress we've already made on the server.