It is possible to cross more than $20k but how long it is going to take nobody don't know because the market situation and from the news makes the piece of bitcoin more stable. It is a very good sign for bitcoin to hold them as long as possible to increase the price.
The possibility of returning to that price certainly still exists, moreover the development of bitcoin is still going on. but we don't know when it will happen because price changes are influenced by many things, we dont know what will come in the future, all we do is believe and wait..
Yeah it is right that time is not guaranteed when it will cross $20k. I also hope that the future of bitcoin is good and gradually the price will rise more and more but it is possible if we trust and believe bitcoin and invest in it and also convince more and more people to put their money in bitcoin for to earn some money for free if the price goes high in the future.