Fishing Morua over Christmas/New Years

I have fished Morua a few times with so-so luck over the past couple of years. Can anyone recommend a good technique for this time of year? I mostly fish low tide, right at the mouth of the estuary, preferring greater tide swings. I've caught a few corvina, triggerfish and flounder, but not with any regularity. It really seems to be hit or miss (yeah, I know, welcome to fishing).
Just looking for some tips on what might work at this time of year. Thanks in advance.
 
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