I have a few suggestions!
•Pillows
•Blankets to put in beds and on couches
•Plushies
-Bunny plushie
-Cartoon fish plushie (make it more cartoony and cute (like it looks very soft))
-Pig plushie
•Playpens to put the cats in while you're building so they don't interrupt you (their needs are still filled tho)
•Long cat scratching posts so that they can climb on them
•New cat beds
-One of those cat beds where they're hollowed in
-A long bed to fit 2 or 3 kitties
-A paw bed
-A mushroom bed (also borrowed from the fairy neighbor)
•Chairs for kitties to sit on
•Accessories !!
That's all I have :) I hope you add some of them ;3 if you can't add all of them in one version, u can just add them slowly in each version :)