What is the ruling on my prayers and fasting, given that I masturbate once a week, knowing that I have made great efforts to reach this stage of reduction?

For the questioner to be better now than before by reducing sins and becoming regular in prayer and fasting is a good thing. However, he must complete this by entirely abandoning the sin, because repentance is an immediate obligation. He must seek Allah's help and sincerely strive against his own self to be guided in abandoning disobedience, as Allah Almighty says: "And those who strive for Us - We will surely guide them to Our ways." It is recommended to frequently fast, accompany the righteous, occupy oneself with beneficial matters, and distance oneself from places that might incite desires.