i find down in s louisiana fish bite hard early or late then shutdown . nothing i try helps to get another bite like the fish left the river HELP ME PLEASE

Go to Mexico, that's where they all went. lol.

Have you tried a drop shot tube? not sure of the water color but the more stained the water is the darker the tube I would use.

How big a river? I fish a small river (avg. 100 feet wide and 10 ft. Or less deep) that has lots of fallen trees in it. The fish bite a little better during low ligh but can be caught all day long. I try to hit current breaks hard and areas with overhanging brush that creates shade. If you can find both that's even better.

Fish in warmer water like the ponds or coves that run off the river.

Downsize on your lure and line. Try fishing a very subtle lure with little action and the just the opposite as well to see how they respond. River bass, or any bass for that matter, during the middle of the day will hold tighter to cover with a smaller strike zone. Unless it's overcast or pretty windy. I'd go sublte or look for a reaction bite TIGHT to some cover or structure.