Think of a memorable holiday memory and write it down.
I recently read a story that John McCain wrote about one of his Christmases as a prisoner of war. Reading it took me back to the time of the war with Vietnam. I could feel his pain and isolation and yet the story left me with hope. It was a hope that trancended war and that particular time and became a Christmas message for the future.

While most of us don't have quite as a dramatic story as his shared Christmas story, we all have something worthy of sharing about the holidays. Despite the year, circumstances, environment, or type of celebration or lack of celebration, the emotions will trancend the differences.
Writing may give someone future hope.