I have sold over $4M+ worth of Bitcoin, how to access the cash and avoid a huge tax bill?

I am a tech enthusiast and I did some Bitcoin mining on my home computer when one bitcoin was just a fraction of a dollar, mainly as a hobby, not imagining how much Bitcoin would grow.Years later those bitcoins are worth over $4million dollars... What is the most tax efficient way to withdraw that money? Any advise? This is giving me much anxiety, any help is much appreciated. via /r/Bitcoin http://bit.ly/2gfLztH