What is the solution to the problem of involuntary nocturnal masturbation that occurs daily and causes one to miss Fajr prayer, knowing that attempts have been made to fast and wear multiple layers of clothing without success?

If masturbation occurs during sleep, there is no sin upon you, and it does not affect your fast, because you are not held accountable for what happens without your choice. You must strive to wake up to perform Fajr prayer on time and with the congregation if this leads to missing it. You should supplicate frequently for ease in getting married and for deliverance from this matter.