If you really want to double that you have to start searching what cryptocurrency is all about, what is bitcoin, what are the basics of trading(TA's and FA's), how can you trade bitcoin to altcoin. Just the same time while getting some ideas of people here if you combine it that you knowledge you have on searching probably it will doubled your money. But it's very hard and pure luck crypto is all about patience and you have to over come your greed here because if not you will lose all of your money.