I had my first experience of Christmas alone last year. Obviously the pandemic was largely responsible as the plans for a 5 day get together were changed to 1 day at the last minute. I live near London and DD in Glasgow, so planned trip there was cancelled. DS, DiL and GS couldn't visit from Germany either. I also had my first ever Christmas with no presents as DS and family had sent a joint gift hamper for me and DD to share which went to Scotland! I only get 1 gift from anyone outside the immediate family and that arrived about a week later! I'd just retired too so not even a secret Santa from work!
This year will be different as DD is moving back to live with me having secured a new job in London starting in January so I'm confident of having her to share the day with, but DS and family are going to DiL's family as already agreed. I will see them when they arrive in the UK and before they leave again as I am the Heathrow taxi service for them, though length of stay still to be confirmed.
If I'd known sooner last year I might have volunteered at a homeless shelter, though I don't know if they were operating last year, again because of the pandemic. A friend of mine used to do that when her children were younger if it was her ex's turn to have them on Christmas day.
I hope you find something to do that you will enjoy, and that you will see your family at some point in the Christmas season. Sadly many people who live alone end up spending Christmas alone as families increasingly live further apart and often overseas as mine do. However disappointing it is, we all have to plan the best way we can and can't be in two places at once.