Hi there. I had a similar experience. I contacted POI around November this year, all of them replied me. Only one said she wanted to interview whenever I think it's ready. When I was closing to my application, I emailed the POI to let her know i am ready for the interview, however she did not reply me and then I sent another one after a week. Eventually we had a Skype interview the end of January (before POI received my application). It went pretty well but we did not have any contact since the interview. At the middle of the march, I was quite worried about my application so I just sent her another email with my update CV and told her that hope my update CV will help my application. She replied and told me don't worry and I will receive an offer no matter what. I also sent the same thing to another POI, she kindly told me I was on the waitlist and my update CV could be helpful.
I suggest you contact your POI, sometimes they are just busy and simply forgot replying you. If your POI relies you, you may tell whether you still have hope or not.
I totally understand this is a really stressful period. All the best!