What is the ruling on masturbating during the daytime in Ramadan after waking up from sleep, with awareness of the act, and how does the doer repent to Allah with a repentance that earns His pleasure?

Masturbation is forbidden at all times, and its prohibition and punishment are intensified in Ramadan. Whoever masturbates intentionally and ejaculates, his fast is invalidated, and he is obligated to make up for it. Repentance is achieved by abandoning the act, regretting it, and resolving not to return to it.