Just because price of something goes up and down it doesn't mean it is pump and dump.
Pump and dump is a market manipulation and the dump is always equal size to the pump or pretty close to it. Meaning if bitcoin were a pump and dump its price should have never gone up.
For example take a pump and dump shitcoin like ETH, its is pumped to 0.15BTC then dumped hard down to 0.03BTC and can never go back up again.
But bitcoin goes from $31k to $48k then has a correction to $44k and then goes back up to $47k again getting ready to break $50k. In a pump and dump however, the price would have gone from $31k to $48k then dumped down to $31k and went lower to $25k.

BTC a few months ago was in the $28k $-30k $ resistance area now BTC is up to $47k and still in the strong resistance area my guess the next price BTC goes up will be $50k, and By the end of this year BTC will go back to $60k or maybe more.

price will go up back again to its previous at $64k. whatever happens in between $30k to climb up again to $64k, it's somewhere lies to what traders and holders do when there is news coming out. when the price drops to $3k in 2019, the Bitcoin believers are already thinking of more than $20k. if you are one of them then just observe what bitcoin companies and institutions do and not what they are saying.