Yes, they can manipulate but they had no power to full control of the price, once a strong demand was on the top and those crypto enthusiasts will holding their Bitcoin, whales are nothing can do. Or else we should learn how to ride those movements of whales.
investors to follow. If you will analyze and build your own grounds you won't be affected by this principle, although you can also have the good chance to work with those fluctuations if you do have spare money to invest. Set aside your holdings if you already have it from your wallet use additional money to reinvest if you plan to deal with the current dropped.