How can one stop repeatedly watching pornography, despite memorizing the Quran and attending lessons and sermons, and being married with frequent intercourse? What are the suggested solutions for this?

We advise you to strive for the rectification of your heart and the strengthening of your faith by clinging to Allah and supplicating to Him, and to be certain that you have no power or strength except through Allah. Be keen on good companionship and a faith-filled environment, frequently remember death, reflect on Allah's signs, diversify your acts of worship, and recreate within permissible bounds.