You have watched hours of YouTube. You took a few lessons from the pro at your local course. Maybe you bought a swing trainer. For a week, something clicked. By the weekend, the shanks were back.
The problem is not effort. The problem is that every fix you tried was a general fix aimed at a general golfer. Nobody looked at your swing and said: here is your specific root cause, and here is the exact drill that addresses it.
So you rotate between ten swing thoughts. You chase the feeling from last Tuesday. You add yards one week and lose twenty the next. You cannot trust your swing because you do not actually know what your swing is doing.