I had a pretty bad day of fishing today. It was really cold and one of my spinning reels broke. I tried everything and fished super slow like everybody says and still couldn’t catch anything for 5 hours. Does anyone have any tips for catching winter bass?

For fast current and water under 40 degrees just try again and hope for the best. If you are fishing still water you have much better odds. Suspending jerkbait with extra long pauses and then some even longer is good for cold water. Leave it sitting still on a slack line and pay attention, they will hit it surprisingly hard. Small hair jigs and tiny tube jigs work good for smallmouth

Dropshot 20-30 fow... blade baits...long pause jerkbaits... slow drag, and I mean slooooowww drag a neko rig. 

Fish areas with deep water near shore. Fish will use these areas because they can move from deep to shallow quickly to feed. I've done best in cold water dragging a jig or shakyhead, fishing a suspending jerkbait with soft pulls and long pauses, or fishing a jigging spoon. 

Hopefully someone in your area will help.  Personally have done well in cold water with 8# PP and a 6# fluro leader.  Using a small lead head of about 1/8 or smaller with a small senko or dinger style bait.  Cast long distance and either count down a certain depth or let go to bottom and reel in slow and steady.  As for colors .... in clear water or slightly off colored  I like pumpkin or ozark smoke.  But I do carry a number of colors....green pumpkin chart tail can be amazing too.  Just got in the mail some bluegill that I am soooo anxious to try.

Tight Lines

stay home, stay warm. I'm too old for that now. I remember fishing in some good snow storms, but these old bones just can't take it any more.

https://www.bassresource.com/hank-parker-fishing/winter-bass-fishing-tips.html