For me it depends on what I have been doing: bowling too much, too little or fooling around with too many balls or speeds & releases? Each cause has a different solution. I believe one has to determine the cause to determine the solution.
If I am totally lost, I take 3 balls: mild, medium, spare and go practice basics with the same release and speed, until I feel comfortable again. Comfort throwing and at the foul line, while posting every shot, is usually a good sign that mechanics are back in focus.
If it's a ball problem and I get confused, charting each ball's results, ball path, how it hits, how it deflects and the like on several oil patterns can usually point to what's wrong and what's needed.
If I am really desperate, I will arrange for substitutes for my leagues and take one or two weeks off and do nothing. Haven't had to do that for 3 or 4 years - thankfully.
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"Those who do not remember history are doomed to repeat it."
