I live in New England and ride all year round. Aside from the obvious stuff like good layering, and fenders. The best thing I've found are toe warmers. I tried booties and winter shoes, but the best results are with simple toe warmers. They don't just keep your feet warm, but make your whole body warm. Get them in bulk on Amazon. HotHands Toe Warmers (5 pair) https://www.amazon.com/dp/B01B1SQJLS/ref=cm_sw_r_cp_api_JDSgybDNTQVN9
I had what would be 2nd - 3rd degree frostbite in my toes/feet. Fourth degree is when parts fall off so I was lucky.
I feel cold in my toes/feet now very quickly, even in temperatures above freezing up to around 50°F if I'm outside long enough.
In the military I was considered a cold weather injury and had to change socks a lot in the field. Plus I was given indoor duties when there was the opportunity.
Toe heaters are excellent.
Pro-tip, put them on top of your foot/toes, not under and as close to your toes as possible.