Resistance wasn't that strong, the psychology to go over $20k was too strong. We have broken over a lot more resistances and a lot harder resistances because the price wasn't that big. I remember there were days when $9.2k had record breaking resistance that required so much money that we never saw that much money injected into crypto that easily, but we broke over it thanks to both people spending too much money buying but also sellers removing their orders and making the wall a lot smaller to break over.
The same could have happened for $20k and could still happen, we do not have a big wall at all, it is a wall we can easily break over with no time. However we need to first convince people to realize we are not in a bad situation, when they see $20k many people assume they should take out their profits and that needs to stop if we want to go above.