I can't find the option to choose a new tree for this year, but other people are saying that they've been able to. Yet for some reason it still shows my tree from last year. Is this an error or something? Were they supposed to be available yet or not?

I'm guessing they were sneaky and found the link in the news post from last year.

https://subeta.net/explore/luminaire/tree/

Thanks, I guess they didn't want it to be available yet but people found a way around it

If that's the case, they would need to take down the page. Subeta users are too resourceful :P

, . Sneaky (resourceful) Subetan here... I went to my ornaments inventory page, then clicked on "back to tree". I could pick a tree, but not decorate it yet.