Just a thought but if you mail now in a “holiday” A7 size envelope with a stamp your audience may be more inclinded to open. Maybe a Happy Prosperus New Year theme?
I love what you have done, has a lot of energy, but did you check with your local post office to make sure that these will be mailable. The post office has a lot of regulations regarding the mailing side of a postcard.
Let us know, because I would love to be able to have more graphics on the mailing side of the postcards I design!!