Make sure your presentation is very slow. Use ultra light setup so that you can feel every tick on the other end of the line. Go during high tide. And lastly LOCATION, LOCATION, LOCATION! If you are not getting any nibbles in one area, then move. Keep moving until you find a more productive spot.
I found my new honey hole this week. I caught around 30 spotties within an hour. It was like catching a bunch of mackies out in the open. They were all bunched up together and every cast I threw at that specific spot I would get slammed. Anywhere else around it I wouldn't get as many bites. I would catch a spottie on literally every other cast. At one time, it was non stop action where I would get slammed on every cast and was catching them from left to right.
Sometimes you could do everything right but if there aren't any fish where you are fishing, then you're not going to catch any fish. You've got to fish where the fish are and with that comes time to really know the water by experience. The more you are out there, the more you will know which parts of the harbor are most productive and which are least productive.
Just keep working any visible structure and soon you will be catching more fish than you can count. Good luck!