Very easy, you just have to go all in on Bitcoin right now and wait. Let's see, we are now at $454 dollars, seems like some idiot whale panic sold and we will have a correction, so it's a good time to go all in and buy the dip.
Once we double $454 i'll bump this thread to remind people how easy it was to double your money, but of course, it's no my money so ultimately you are responsible of your actions.