You eventually will need to talk directly to Jet Blue.
After the first round of elevator wait music, sometimes you will be prompted for a call back number and not wait on hold.

We had the same flight out of DCA booked in January DCA-SJU-EIS. We canceled due to covid.
I was able to get them to refund my entire ticket price for the four people I booked on my JetBlue credit card.
I know it can be hard but be nice on the phone.

Hate to ask, but did you get trip insurance?