One thing I've learned over the years, If you know fish are there and they are not biting.
Change speed slower or faster I've seen .6MPH worked great only to follo next day at 1.6 to catch fish
Change depth sometimes a foot closer to where they are marked and sometimes a foot farther away makes all the difference.
Change color usually my first change. I do a lot of jig fishing and by the end of hour 1 wll have a dozen or so different colors on the dryin rack.
Change bait sometimes a different action sets them on fire