my prediction is that Bitcoin will be back to 20K before the end of 2019. However it may only get back to 20K after the having next year.
How come is there any prediction proof you have to show and prove that this amount will be reached? But I believe we can find the Bitcoin Roxie to reach the 20k USD at the time halving.
Even last time bitcoin reaches the big value from 2k USD to massive 15k USD and more value. So I expect it on 2020.