I'm Wiccan but was raised that and Christian. Several traditions my Mom started that fit for both. Writing a "hint" about what a persons gift is, on the gift tag or card. Cooking lots of good food or having plenty of snacks on hand. Watching a holiday movie.
Adding a new ornament to the collection each year.
Growing up Christmas was usually just myself and my parents plus my godparents. My Dad always wanted a big to do. Food, tree, etc. My Mom and I much preferred small and less prep.
Am in the process of establishing my own traditions.