Every slice you've ever hit started in the same place: your lead wrist. When it cups at the top, the clubface falls open, and once the face is open nothing downstream can save it. Not a stronger grip, not "swinging left," not that new driver. The face arrives at the ball open and the ball curves right.
And it's not just you. Golf Digest found that 84% of golfers playing off a 20-plus handicap slice the ball. More than 8 out of 10. Yet almost none of them are ever told the real cause, so they spend years fixing their path, their grip, and their setup while the wrist keeps throwing the face open.
That's why the tips never stick. You've been treating the symptom. Fix the wrist and you fix the shot.