Write whatever you want. Hopes and dreams and goals for the new year, things you want to leave behind, things you want to remember. Fears or stories or secrets. Anything.
This can mean whatever you want it to. You can do this whenever you want to. Time is ultimately an illusion. It doesn't have to be December 31 or January 1 for you to be here.
Nobody can see what you write. It doesn't go anywhere. The form resets, and it's gone.