You think too far ahead because the end of 2019 also hasn't happened yet. no one can be sure of the exact rise in bitcoin prices, let alone have to predict the end of 2020 as what you say. we can only follow the flow of market price movements because any increase that occurs cannot be accurately predicted
OP trying to predicted for 2020 because in this year bitcoin will has most important moment.many expert and crypto communtiy very confidence at that year bitcoin price will touch new record.it based on previous data and research , after halving btc price will moon.and if we make this prediction i think there no fault for it.as trader and investor this the thing that we have to do.