We had a couple of years of failed attempts, then moved to DE, was supposed to be a proven donor w/ big numbers, etc...
Few eggs produced, fewer fertilized, fewer grew. We transferred the two best looking ones at 3 day fresh. Watched the numbers continue to dwindle and froze two 6 day blasts that looked pretty mediocre.
The fresh failed.
We transferred both dubious 6 days and they're now 7 year old twins.
Hang in there OP - will keep my fingers crossed for you.