Obviously, there is no single way to master solid contact and taking lessons is an obvious way to achieve it. I did not ask the question in the right way. What is your personal secret for better contact?
I recently found one, which is to align my hands directly under my chin at address. This recently enabled me to make purer contact. If they are more towards my Adam's apple, I hit more towards the heel. Thought it would be an interesting question to solicit individual preferences.