The ONLY reason the price is down is because somebody somewhere out there decided to
dump it at this price, not because Bitcoin is suddenly less valuable.
That's the same as to any other value, as long as someone believes and is using what Bitcoin was made for, then it's valuable. It could go to a lower price and could give you more possibilities to claim more. I think this is a good way to increase your holdings in BTC. You will never know when it increases or decreases. What I usually do is do a DCA, averaging my bought price and continue doing it.
Exchange prices can be
easily manipulated (fiat banks) and are highly sensitive to the unpredictable decisions of big
traders who are acting on emotion. Whenever this happens, it's a huge BUY flag.
Manipulation has been always a rumor, I don't know if there is already evidences to show that it has been done but I don't speculate or consider that to affect me in my decisions. I know what I would do and stick to my strategy.