12 btc is a huge amount to have and cannot afford to loose a single penny out of it, so without taking any risk I will prefer to play safe by simply holding them till the end of the year and if price goes high then will sell them and invest that money in real world.
Right about that, just hold it and do not spend it to anything else, it will be profitable soon or later just keep holding it for a long time!
you are right that hold that hold your bitcoin for the future because bitcoin is going to increasing its price too much faster and its really profitable if your hold your bitcoin as long term investment and i think that hold your bitcoin is much more better than other investment in recent time.