Cold water means fewer bites on a glide bait - but the ones you do get tend to be some of the biggest fish in the lake. Three things need to shift once temperatures drop: location, retrieve, and casting angle.
Where to look
Main lake channel swing points - a channel swing butting up against a long, tapering point - are a proven cold-water pattern, especially with deeper water access nearby (the exact depth of that transition varies by region). Bass are cold-blooded, so on sunny days they'll often suspend higher in the water column to sun themselves and warm up, rather than glue themselves to the bottom - standing timber radiates heat and pulls them in the same way. Any structure that reads as high-percentage on a map - points, humps, saddles, subtle depth transitions - is worth targeting, along with brush piles and rock piles, especially brush that tops out four to five feet below the surface where fish will suspend and hold. On lakes like the Ozarks, docks with black floats are worth a look too, since the floats radiate heat into the water immediately around them - though it's worth targeting docks that also sit on some kind of distinct structure, not just any black float on the lake. One more note: a full moon tends to pull bigger fish a little shallower than usual, even outside the spawn.
How to work it
Cold water calls for a slower approach than the fast, choppy retrieve that works the rest of the year. A "real bump" retrieve - reel, reel, reel, letting the bait kick out and suspend - essentially treats the glide bait like a giant jerkbait, and varying the cadence the way you would with a jerkbait helps trigger a following fish into finishing the deal. A slow, steady wind with a modest side-to-side kick is the other go-to, and mixing the two - slow retrieve, a couple of bumps to kick it wide, back to slow - tends to outproduce sticking to just one.
Change your angle
Watch how everyone else works a piece of structure - usually straight from deep water toward shallow, the same way every time. Doing the opposite (working from the backside of a point, out over deep water, toward shallow) presents the bait from an angle those fish haven't already been conditioned to. It's hardest to apply on every single cast down a bank, but most valuable on the highest-percentage targets, where repositioning the boat is worth the extra effort.
Fire up the school, even without a bite
If you've marked a school on electronics but can't get them to respond to anything, try sinking a glide bait (with a little lead wire added to the front hook for a faster fall) right down on top of them and popping it a couple times. Even without a bite on the glide itself, it often agitates the school enough that a jerkbait or jig worked over the same spot afterward starts producing - multiple 20-pound bags have come off single spots using exactly this sequence.