Lots of large fish could be captured right at the sea's edge. This is where the waves separate the clams and other shellfish which give the food to video game fish. I have viewed eight foot bull sharks incorporated water that was unqualified my knees. They weren't consuming the clams, however they were consuming the fish that existed to eat the clams. Seldom do I view browse angler casting simply beyond their feet. Often they cast as far as they could assuming the much deeper the water the bigger the fish, but this is not always true.
The following time you fish, search for anything uncommon and also attempt a couple of casts there. It might be a color adjustment in the water, a washout from the coastline, a bulkhead or boat dock, a jetty, etc. They all give shelter or food to the little people which brings the predators.