When going out on your fishing trip, take a variety of bait with you. Usually pilchards, bonito, trevally and mackerel work well.
If you know fish are there and they are not biting what you are offering, then try some other type of bait.
When you do catch a fish, open it up and inspect it's stomach to see what they are eating. If they are eating very small baitfish then try to cut your bait in the same style to represent a small baitfish (a strip bait). If they are eating crabs then cut a big blobby shaped piece of bait. If they are eating worms, tie on a strip of red material to your bait to represent a worm.