If I would be an investment bank I would pump bitcoin mostly with the money of my customers to a bubble.
market cap: $ 200 billions
nearly $ 150 billions of them are sleeping
with $ 10 billions you can move the price in what ever direction you want it to move. This is some kind of small change for the big players.
The more the price rises the more easy it will be to get more money from your customers who wants to invest and earn a lot of money.

Then you can start to buy short positions with your own money. After the crash the money of the customers is your own. Maybe investing it in coins for longterm, when everybody else think the game is over.

Only some thoughts but keep calm I am not an investment bank.