It was really unfortunate that some people weren't able to buy while bitcoin is currently at its lowest after the 2017 sudden pump. Many lost hope and never imagined bitcoin would reach the kind of value that we have right now. In terms of seeing bitcoin getting lower than $20k again, there is a very little chance of this happening. Maybe bitcoin may go down to atleast $30k or $40k but seeing it going lower seems impossible. Bitcoin has already became stable so far and even if it will face another dump, it will still be able to neutralize and stabilize its value where it wouldn't go too far from its current all time high.