for what it's worth I've suffered with cold feet my entire life. I've tried every possible new boot and sock, along with every other fad that came along.
If u are limited to just boots and socks, no boot blankets or the like, I've had the best success with a silk liner and a thick Merino sock.....By far the best has been Wool-x.....who also makes the warmest and most comfortable base layers and mid layers. Their stuff has blown me away...and I've tried many.....minus -33, smartwool, filson, Sitka, Kuiu, etc. It's expensive but you can tell immediately it's higher quality.
But the secret sauce with my feet is applying scent free deodorant all over my foot before putting on the socks. It sounds goofy, but it really keeps them from sweating, which is vital to staying warm.
I also use Dry Shod rubber boots with high insulation when I'm totally stationary. Make sure they are plenty big enough to move your toes very freely.
My regiment of deodorant, silk liner, Wool-X sock and Dry Shod Arctic's have kept me in a treestand with temps in the 20's and a stiff north wind all day. And that wouldn't have happened 5-6 yrs ago.