I strongly believe that if some well known investors come in and buy billion dollars worth of bitcoin it could be world breaking news and the price of bitcoin would soar high to $10000, just my opinion.
I believe there are already big guys buying BTC via OTC markets! Buying steadily over the whole year.
When there will be an announcement that for instance X or Y famous investor decides to buy into Bitcoin he will already have done since a while. And then of course I agree the price could spike due to some noobs fomo buying and the smart guys taking some nice profits before buying the sold stash back again.