A solid putting technique is a prerequisite for consistently hitting the ball in the middle, and with the method recommended here, this is done "blindly" because the eyes are focused on the hole and not the ball. Therefore, if you have not yet established your putting technique, it is advisable to ensure this in advance through targeted exercises.
For the dosage, a short backswing that is as compact as possible is recommended, followed by a long follow-through. This ensures that the putter head accelerates through contact with the ball.
Recommended exercise for solid ball contact: At the end of the clubface on the top and bottom, limit the putt path in both directions with a tee stuck into the green. This creates a narrow channel through which your putter head must pass. Position the ball in the middle of the tees and play it without touching the tees or getting stuck on the tees. If you get stuck, make the passage a little wider first. In addition, your focus should be on the sound that is produced when the ball is hit in the middle. The task of the eyes to ensure good ball contact is transferred to the ears, because the price of keeping the eyes on the target must not be that the ball contact suffers. You will be amazed at how quickly this changes and how the brain is now able to implement "better processing power" with more information.
6. Execution and mental focus
Now you are ready to start the putt with your eyes fixed on the hole (during the test swings and execution). It will take some effort at first, because so far they have certainly tried the opposite, namely "not looking". You'll notice how much more natural it feels to have the ball in your field of vision immediately after hitting it and tracking it from start to finish. You feel a connection to the thing that previously felt like a shot in the dark. Even though amazing results can often be seen right at the beginning of the change, this must first be consolidated over many hours of repetition in order to be able to use it reliably in pressure situations. However, once this hurdle has been overcome, there will no longer be any reason to return to "blind" putting.