Two things have helped me a ton, first is moisture management via a combination of antiperspirant and vapor barriers. I wear anitpersperant, a thin liner sock, then believe it or not simple plastic bags, (think checkout thin ones,) then Wigwam or the like thick squishy hiking socks. Companies make actual vapor barrier socks, but I've never needed or gotten around to buying some.
Thin socks act as lubricant to prevent blisters. antiperspirant and bags keep your sweat from the main sock and insulating layers of the boot. Thick wool sock adds comfort and warmth. This combo plus Meindl boots, only 400g Thinsulate, has kept me warmer and more comfortable than the 1000g Rocky's I used for years, while actually being walkable. Meindl uses cork and wool for their insoles, which I've switched too for other boots. That has extended the comfort range a ton as well.
Another big thing to remember is insulation the boot itself from the ground. You would not believe the difference standing on a piece of soft foam, think non-inflating camp mat type material, makes in keeping your feet warm. I use it to cover metal stand bases where safe, no ice, and when ground blind hunting or standing. Easy enough to carry a bit of it with you, and makes a shocking difference.
