If you’re indicator fishing, a larger bobber and a long leader (maybe as much as 12-15’ or longer). Thin tippet will cut through the water column faster. Keep adjusting depth and/or weight until you either get fish or catch the bottom once or twice every 10 casts. A problem you will run into is getting a good drift since the water at the surface will be moving significantly faster than the water at the bottom. This will drag your flies. By adding a lot of weight you can slow down the indicator some and help your flies drag at say, a 40-45 deg angle vs 60 degrees or higher (the bobber pulling them). Also, if you are long-line nymphing (fly line on the water), you will need to mend your fly line upstream often or your line will drag the bobber and thus drag your flies.
If you’re Euro Nymphing the same applies. Long, fine tippet and heavy flies.
If you’re fishing streamers, a sink tip fly line is best but if you don’t have one, a fast sinking poly leader with a heavy fly may get you down to the strike zone.