Be as clear as you can about what species your fishing for. Are they hit and run merchants that hide in amongst snags logs etc. Bait choice, color and methods of presentation is really important.
Rule of thumb is dark water, dark baits or lures.
Above all apply the KIS principle. Or it could be that fish go deep in cooler weather. Local knowledge is usually the key and if your not sure, see if someone will tell you a bit more. Rarely does only just one technique raise a scale on any given day. If your trolling and not much is happening then stop and vertical jig over, or near, some bottom structure etc.