Rotate decorations each year. If you've developed a large collection, don't feel obligated to display every single item you own. Pick and choose, and alternate what you bring out each year. This way there will be less clutter and you'll truly get to enjoy the things you display, instead of losing site of them in the midst of massive clutter.
Consider other senses. The smell of evergreen and cinnamon (or whatever it may be for you) is a large part of what we associate with the holidays. Whether it's your tree, collected evergreen branches, or scented candles, smelling Christmas is an important part of the experience.
Embrace the imperfect. Display things you love and that have sentimental value. While the store windows during this time of year are stunning, your home isn't a display case. A Charlie Brown Christmas tree that fits your small space, also adds an element of charm. Old photos with Santa or the puff ball wreath your nephew made are great reminders of past events and tend to spur fun stories.
Add an element of sparkle. Gold, silver, copper and other metallics add interest and catch the light. Even just a simple strand of lights, like these starry string lights, create a little sparkle and can be used for numerous applications besides the Christmas tree.
Do you have any tips to share for holiday decorating?