What's the fastest way to catch up on my lost sleep?

I know that the best way is to do it gradually, but I don’t have time for that. So I ask you what are all the best possible ways I can catch up on my sleep fast. everynight I go to bed at 11:30 pm, fall asleep at 12:30 and wake up at 9:30am…have been for months, I’m on a strict schedule for now. The past two nights I was up until about 6:30 am!!! I slept in til about 2pm today and only 11am yesterday.

So as you can see I already caught up a little bit, but I need to catch up all the way, as fast as possible. I was thinking about taking a nap again today around 4pm if I can, and then taking “melatonin” tonight when I go back to sleep for the night since I can never fall asleep at night when I take a nap in the day anywehere after 3pm.

So you tell me please, what do you think I can do!! please help. I’m 19 and am a male. And by the way I won’t be doing this all the time, like I said I can’t remember the last time I stayed up that late, this is kind of like a one time thing.