If you will indulge me for a moment, imagine that you are, quite suddenly, quite dead. Consider those people you hang around the most, those who will be most wrenched by the sudden loss of you.
Now, don't you wish you'd written a final letter, or made a video saying goodbye? A final message, saying farewell as only you can?
It's not that hard. Just write down the things you want them to know, the things you wished you would have said (only now you can!) while you were alive. You can give advice. You can tell them to go on without you. You can remind them to floss.
You can say "I love you."
To me this sounded like a New Year's resolution that could actually make a difference. So I did it.
Have you? If not, why not? It doesn't take long. It's easy to do. Yes, it can be a bit emotional, but think about it: do you really want to leave without having the final word? I bet you don't.