No one would  ever  know  on when  bitcoins price would dip  or  decrease its price and thats the reality on trading  , price prediction is  so hard to do  because  you wont even know  when and where it would  move. If theres  people who could  guess on the price then for sure  he would  be rich on trading field  but in  reality there no one could able to do that  because we are just  humans btw. If you want to engage on trading you  must learn first  on the things  about it.