Copyright is from creation, so you already have copyright, but there's no registry for copyrights the same way as patents and trademarks. The best you can do is have a way to establish that you created it first, and you didn't snick it from somewhere else, then pray that everyone attributes it to you.

OTOH, you can register it as a trademark for a good or service. I'm seeing 2020 chocolates? *one Japanese manga sweat/teardrop*