How can one stop watching pornography and return to prayer and repentance to obtain Allah's forgiveness and pleasure, especially after repeatedly breaking oaths to abandon this sin?

One must promptly initiate sincere repentance from all sins and transgressions, especially abandoning prayer, for it is a greater sin than other major sins and may even be considered disbelief (kufr). Maintaining prayer helps in repenting from other sins, as Allah Almighty says: "Indeed, prayer prohibits immorality and wrongdoing." One should remember Allah's knowledge and His watchful eye when tempted to commit sins, and reflect on the horrors of the Day of Judgment and Allah's punishment. It is advisable to associate with righteous women, and replace forbidden things with watching beneficial lectures and reading and reciting the Quran. He who repents from a sin is like him who has no sin. One must offer expiation for each broken oath by feeding ten poor persons or clothing them, or fasting three days if unable to do that.