My winters are between -10F and 40F and I ride 3-5 hours total over two or three trips in a day, most of them with the sun down.
The four biggest game changers were super duper bright lights, fashionable (I don’t know whom they’re fashionable to- there’s really not that many cyclists in my community) tight winter bibs from Pearl Izumi, reasonably cheap Bellweather wind-resistant jacket, and wool baselayers. I don’t care how “fashionable” anyone thinks it is or isn’t, I absolutely love my Surly wool zip jacket and, if I’m feeling spicy, I’ll wear it over just a summer jersey down to 25F without the Bellweather.
I’ve tried a lot of non-cycling outdoorsy gear over the last decade for cycling in the winter. It all probably works fine in the disciplines for which they’re intended.