How could 13-14 million usd worth of bitcoin be invested in such a way that it will grow exponentially like 10x over gradually in a couple of years in the u.s.? Would this be feasibly possible or not? How could this much bitcoin be put to work? What kind of investsments will allow this?
Any money already in Bitcoin is Bitcoin, it is already invested, what remains is the timing on when to sell and take profit, some will hold for a year while some will what to hold for many more years.
The future growth depends on how long you plan to hold, 10x is still possible with Bitcoin but you will have to hold for the long term, there is no long term holder that isn't doing so well today, you only need to safeguard your private key.
As per the past history of Bitcoin, holding is proven to be the best technique thus far.