We have a few things we/I like to do, but to call them traditions would be strong! Like you, my husband humours me and joins in with some things, but left to his own devices wouldn’t even bother with a tree. Also bear in mind my DS is 12, so we’ve had time to ease into our Christmas routines!
I like us to go to Christingle, usually just me and DS; we haven’t made it every year as it’s at 4pm the Sunday before Christmas, so sometimes we’re doing other things, and this year boy and husband were both isolating.
A walk round to see the Christmas lights (again just me and the boy generally).
Usually a trip to a local garden centre’s Christmas world (not this year as one or the other in isolation since 8 Dec until tomorrow).
We did manage a trip to an illuminations display before covid hit us, which was so lovely, so I think we’ll try and do something like that again next year.
On Christmas Eve DH takes DS out for a bit somewhere while I sort the last bits, gather presents from hiding places and stash in an accessible place for later. This year they’ll probably go to the golf range, other years it’s been soft play, park, visit a relative. Also Christmas Eve I cook a ham joint and we have some of it for tea with egg and chips, then ham for over Christmas too.
Between Christmas and new year (often NYE) there’s usually a trip to the seaside (local, very much arcades and pound shops) for a walk and chips on the seafront.
Thankfully the elf wasn’t a thing when DS was little enough, so we dodged that one.
Basically everything has evolved over the years - do the things you like each year and keep the bits that work for you. Ours aren’t Instagram perfect life type activities, but work for us.