Best way is gambling. I turned 0.6btc into 40btc in 4 months.
You must be one very lucky guy.
Is there a specific game you like?
And is there a specific method you use?
I don't think there is anything known as strategy in gambling. All so called strategies are going to lose to the house in the long run.
It's all about luck. You either win crazy big like this guy or end up losing all your cash and go broke.