If the water levels are low and the water cold, I’m looking to fish in or near guts or channels lined with shell. Edges of drop offs, edges of reefs. Then when the weather warms a bit or the water level rises, I might look to other shallower structures not too far from the cold water refuge spots. The fish might be in or at the edge of the hole in the morning only to move later out onto some shallower structure with a little sun or warm air.
Rivers and creeks can be good in the winter in my experience. I like channels and areas right off the ICW and other deep water like that. I seldom fish the deepest areas, but like the edges of the channel.
Find a hole in your area and then think about how the fish might travel to and from it. The hole or gut or channel is the hub and the surrounding structure is the spokes. Sometimes, the fish are right at the hub and sometimes they radiate from the hub.
Water in the mid 50’s doesn’t curtail a bite especially if it’s been cool for a while, that is what I’ve found. Like others have said ad nauseam here and in countless other threads, fish follow the bait. Look for upticks or bait behaving differently. Bait hugging a shallow reef. Let the bait guide you. Stay still and slow down and watch the water. There’s a signal and there are generally clues to follow. Don’t be the guy that races from one internet hot spot report chasing to the next. Personally, I seldom fish in a spot unless there’s evidence from the bait or there’s sighted fish. I will fish a structure that looks promising, but there’s almost always something that piques my interest. I just don’t do blind casting to whatever.
But this is just me. Others have their own ideas. That’s what is good about forums, lots of ideas and on the water experiences being shared.