I still struggle with a habit of watching pornography and will marry soon. What should I do?

Take serious steps now, because this habit does not disappear by itself after the akad. Many think marriage will solve it, but this habit often goes on disrupting intimacy and trust. Start with sincere repentance and practical steps: install filters on your devices, avoid using your phone alone in your room at night, and identify the triggers, such as boredom, loneliness or stress. Replace that time with other activities, such as exercise or being with good friends. If you have tried to stop many times and failed, get help from a counsellor or psychologist confidentially. Seeking treatment is a sign of responsibility, not weakness. See its effects on marriage.