is it possible for bitcoin to be $ 15000

in my opinion, the possibility is very small, but we look at the beginning of 2019 whether it happened or not.
you may not remember but Bitcoin Price was already more than $15000. it's was not a very long time when bitcoin price was almost $20000. if once it can go as high as $20000 then why it can't go to $15000 again? 2019 will be good time for crypto.