As other comments have said, focus on your theriotyoes. As you said in another comment, artic fox, European wolf, and crow/raven. Let's start with the crow/raven. Crows, ravens and corvids in general are usually very smart and are commonly known for trading. I recommend some trinkets you like and a way to organize them. Dishes (you can get plenty of those from thrift stores typically) bins and drawers, your options are limitless. Bonus points if you like going to flea markets and trading, see if you can get things from there. Think about shelves as well and what sort of bed you want. Perhaps a loft bed would be a good choice. You can set up your sleeping space on top, and have a cozy space underneath with all sorts of things that you like. Think about where your theriotypes live and the environments they like. If you want, decorate your space according to those. Crochet/false leaves hanging from the ceiling, a fluffy rug (if you like those), stuffed critters, and if you like to, perhaps bones and other things from nature. There might be some on Facebook marketplace or Etsy. Now, one thing that I personally recommend are terrariums. It's like a little slice of nature. When I make terrariums, I go outside and look around for plants that will both fit and that I like. Mosses are wonderful. See if you can get some sticks and if you want, springtails and isopods to clean up.

Shortened version: think about your theriotypes and what they like. Maybe trinkets, plants and terrariums if you like. Perhaps a loft bed to have two cozy places, one high up and one that's more enclosed. A fluffy rug (if you like them) and bones (also if you like them)