Hi OP, pagan here 👋
I agree with a PP that winter solstice/Yule includes a lot of the "Christmas" traditions for many of us because a lot of those traditions were inspired/borrowed from Yule celebrations to begin with. Modern druids celebrate the solstice as Alban Arthan (the birth of King Arthur), as the legends suggest he was born on or around the solstice, so you could read some of the stories from the King Arthur legends (could be a nice thing to do together if you have children) or watch something Arthurian-inspired, like the Sword in the Stone or the BBC Merlin series!
Stonehenge live-stream the sunrise from the winter and summer solstices on their channels, so that could be something to do in the morning (easier to catch than the summer solstice as no need to wake up early!).
If it interests you, you could check out the Pagan Federation's website to see if there are any open rituals or other solstice events in your local area. They're generally welcoming of anyone, no questioning as to whether you share the same beliefs, and they tend to finish up with a feast!
You could also do crafts or baking inspired by stars, winter or the sun. While it's the longest night, it's also the rebirth of the sun, so while it might seem a bit weird in deepest winter, the sun is a major symbol of the solstice.
Feel free to also ask this question over on the Witches thread! There will be plenty of good suggestions there I'm sure.