It's not too late to make new year's resolutions! Or, if resolutions aren't necessarily your thing, how about writing yourself a letter to open next year? It can include resolutions or things you hope for or just a pep talk.
If you want something digital, the website Future Me allows you to schedule an email to be sent in the future. Send one next year, or on your birthday or to your spouse on your anniversary, etc.
More of a pen and paper person? Christa at Baca Creative has designed a downloadable stationary that is perfect!