Wow, that is surely such a great gain for you and you really did profit a lot if we compare the prices before. The decision is now whether to turn it into cash or use it as another investment to create more money. 50K btc's is a lot and it will surely be enough to have a happy life before you die. One thing you can do is distribute it to your family if possible or give them capital's so that they can earn their own money within the Cryptocurrency Industry which really is possible since you did it yourself..