It skyrocketed downwards because a good deal of people wore masks and social distanced as should of been done in the beginning of this. But there are still many people doing none of that in states that are trying and not trying to contain this. People are crossing state lines bringing sickness with them and not self quarantining as they should be.
This is why saying that it is going to keep going down given the government's response and the public's response to this wrong. You have a government by an large that does not care as well as enough citizens that do not care as well for this to never end. We can only hope at a vaccine at this point for this virus and we can not even know when a viable one with no side effects will come out.