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For the proper cold days here, or when I'm out walking in the woods, I have a pair of Lundhags Park.
https://www.lundhags.se/se/produkter/kangor/skalkangor/1-lagers-skalkangor/park?c=905
They work really well both in warmer and colder weather as it's just a shell boot. Normal days I just wear a normal wool hiking sock and I very rarely get too warm. Have had them down to -20 for a few hours with a Finisterre welly sock and been warm.
I love my blunnies but the soles gets hard when it's proper cold so not a great winter shoe. Doesn't stop me from wearing them though, but there's better options out there.
Size up in a pair of logger soled Red Wings and use a thin merino liner sock with a thick wool sock and you should be fine in the proper cold, unless you spend whole days outside but then you'll need some proper high end stuff.
The Finisterre welly sock is my favourite winter sock
https://finisterre.com/products/welly-sock-signal