How can one get rid of pornography and masturbation addiction, which leads to repeated relapses into sin despite attempts at repentance and remorse, the feeling of Allah's watchfulness, and the fear of a bad end?

You must engage in sincere repentance and never despair of it, while having a good opinion of Allah, and striving against your soul to abandon sins. Always remember that Allah is aware of you and reflect on death and what comes after it. Persist in supplication, associate with the righteous, abandon the company of the idle, adhere to circles of knowledge and gatherings of remembrance, and frequently recite the Quran with contemplation and listen to beneficial lectures.