Get yourself a bunch of 1/32 oz. and 1/16 oz. marabou jigs; the ones with the chenille body. Get some of each size in white, chartreuse, red/white and red/chart./white.
Use a slip bobber set up with no more than 4# test mono. Start off with one 1/16 oz. jig suspended under the slip bobber....try various drop lengths depending on the bottom you are fishing. I've had my best luck setting the length so that the jig rides just about 3"- 5" off the bottom. S - L - O - W retrieve it back to you after the cast.
If that doesn't produce anything, switch to two of the 1/32 oz. jigs, tied in tandem, about a foot apart from one another. Use two different colors, under the same slip float set up as previously outlined. If that doesn't produce anything, then you're fishing in the wrong place!
Try to find a drop off somewhere. If you don't have a sonar on your boat, then make a drop line. A 4 - 6 oz. weight tied on a 1/4" nylon rope. Tie a simple overhand knot every 5' - starting at about 10' from the weight - and working up to about 20', depending on the depths of the lake you are fishing. Place various colored ribbons in each knot, so you can easily identify what depth your line goes down to.
Dropping this line occasionally will let you know quickly if you are on a drop off. I used this system for many years, prior to my first sonar back in the 80's.
Hope this is of some help! Good Luck!