Practice with an old-school putter.
"There's a glut of oversize mallets full of alignment aids that encourage a straight-back, straight-through stroke. I'm not sold. Try practicing with an old-school putter instead. Yes, it has a tiny sweet spot – that's the point. You'll be amazed how fast you adapt and how much more precise your stroke becomes. You stop trying to steer the club and focus on rolling the ball well."