It has never been a secret and everyone knows it from the start. Only way to manipulate bitcoins is to have tons of money. You can pump the market by buying bitcoins. And you can decrease the price of bitcoin by selling tons of bitcoins. But that only increases/decreases the price of bitcoin momentarily.

The actual way that you can pump bitcoins in the long run is to talk to rich people and encourage them to invest in bitcoins. Bitcoins is a digital asset and investors are usually interested in this type of investment. Some people don't want to let their money sleep. Saving your money in the bank makes your money just sit there and never increase while in bitcoin, it'll increase as time pass by. You can tell that to interested investors or even to just an average joe as long as he's eager enough to learn bitcoins. You'd help in mass adoption, thus, increase the price of bitcoin. Maybe not right after you've recruited people but after a couple of years.