A spray of line conditioner, such as Reel Magic, will help keep your lines ice-free. Use a smaller line size so you can get better hooksets with less line resistance. Low stretch line is best in the winter as well.
Use attractants such as Jack's Juice, which can sprayed on a soft plastic lures. Fish are sluggish and attractants encourage them to hold on longer. Cold water drains energy and body heat rapidly. If you fall overboard, a life jacket can give you the time you need to pull yourself back in the boat before the effects of hypothermia set in. Vest styles can provide warmth both in and out of the water while automatically inflating life jackets allow great freedom of movement and fit over bulky winter clothing. Also, make sure you have a method to get back in the boat, such as a built-in boarding ladder or a short length of rope with loops for footholds that is firmly attached to a cleat or other fixed object.
Check the bellies of fish you bring up and if you find silt, that's an indication that the fish has been glued to the bottom. So take your time presenting the bait or lure, stay in one spot for a longer time and use presentations with smaller baits like drop shot or shaky heads. Find the deepest water close to shore and fish more vertically than horizontally.