It's pretty easy to achieve through trading. I don't know about any other method at present. Trading is only way from where you can earn even more. But don't fall pray to ponzi schemes who will promise you to return 10-15% of daily earning because they are all scam. They will eventually run away with your money.

So try trading with 1 btc initial investment, but start with a small amount to understand the market dynamics. Once you understand the game and the market dynamics, definitely you will be able to make good amount of money like I do from trading.