I had my first Christmas alone last year, having lost my beloved husband to Covid in May 2020, and my DS & DIL not being able to visit from England due to travel restrictions. I thought that even though I'm pretty much a loner, it might be a really difficult time. However, I found a local hotel which was open for Christmas Lunch, and booked that, just to spoil myself, and found it a really lovely experience. (Book early not in December, if you decide to do this!) Then in the evening my DS & DIL and I had a lovely phone call where we opened our presents from each other and "oohed and aahed" - it wasn't, obviously, as wonderful as when my DH was there with me physically, but it meant the day was special.
I also think previous posters have given you some great suggestions.
I hope when it comes, you end up having a lovely Christmas.