For the price go down again to 400 some serious things need to be happening. I don't see this coming, since we got a positive market.
Perhaps after the halving?
The big whales can push down the price briefly down to $400. But it will not last long, the value is there.
Big whales can do anything they want with the price. But they want to profit from it, so why dump a lot of coins to lower the price if they can sell them slower and profit more?
The price of Bitcoin is always changing and that is because Bitcoin is a currency so that is quite perfect for the currency itself.
But you have to also now that it will takes a really long time until the value will be more worth and that would be bad for the people who has no patience for it.