Notice what didn’t seem to matter to them; ask if they could do without it next year <there’s no point in continuing to do things year after year that no one really cares about>
Decorations: notice what you didn’t put out this year. Are you ever going to use them? Do they matter to anyone you know? If so, give them away to those people. If not, give them to Goodwill.
Label boxes: sort items as you put them away so you can find them easily next year. For example, next year when you have a few minutes to decorate a particular room and it would be overwhelming to open every box, by having all the items you use to decorate that room in the same box you can get it done quickly without having to go through everything. If you like to put up the outside lights first, have all the lights together. Likewise, put all your ornaments and tree lights together. You can even break down ornaments into a “favorites” box for each person so those go onto the tree first <it helps to get the kids interested in helping, and I found they used to fight for the “best” spots on the tree for their favorites>. I have lots of Harry and David boxes and store my delicate ornaments in there because the padding and dividers keep things from getting broken. I also like to color code my storage boxes, so if you have the money, invest in red or green boxes to indicate Christmas. I put the things I use first in clear boxes so I can see at a glance what is in there <like Christmas cards, the advent calendar, wrapping paper and ribbons, wreath hangers, hobby items, etc>.
Think of how you use your decorations and I am sure you can think of ways to make life easier next year.