Bass are cold blooded and so are their prey items. As bait becomes less active after a cold snap, I look for bass to suspend where the water is oxygen-rich and they can hold and wait for food to be carried to them. I’ll look for them to be on the lee side of a point with water deep enough to be more oxygen dense.
When this happens, I use lures that I can fish slowly at depth. Swim baits, flukes with weighted EWG hooks, heavier spinnerbaits with Colorado blades, deep diving crankbaits, deep diving/suspending jerkbaits, and some baits than are typically associated with other types fish (mainly walleye) like snap jigging blade baits, jigging spoons, and jigs tipped with Gulp! minnows.
If they are suspended closer to the bottom, drop shotting can be very effective. Try wacky rigging a senko with a weighted hook or Nikko rig it.