Take some paper and make a list of all the things you have not achieved or got around to doing this year. This is not a guilt trip or a way to highlight your failures, but a way to acknowledge all the things just not yet done.
List the big stuff and the small items that you planned or just hoped to do, then go over the list and scratch out the ones that now seem irrelevant or unobtainable. Often we plan to do things, but circumstances change, yet we fail to change our goals. Cross these off and forget them.
The left over items can be used to determine a new list of new carry-over goals for the next year and the next exercise in this process.