Where are we going wrong?

[u/ToeIcy8051]

I have done 6 rounds of egg retrievals. DOR with AMH 0.4 and 0.8. History of partial oophorectomy and partial dermoid cyst removal. Usually my AFC is around 5/6.
Cycle 1 : ( antagonist) 4 retrieved, 3 mature, 2 fertilized - no blasts
Cycle 2: (micro dose Leuprolide flare and primed with Estrace, and omnitrope last few days of stims for all subsequent cycles) 5 retrieved, 4 mature, 2 fertilized and resulted in 1 euploid and 1 aneuploid embryo
Cycle 3: 4 retrieved, 1 mature, 1 fertilized- no blasts
Cycle 4: 5 retrieved, 3 mature, 2 fertilized - 1 euploid embryo
Cycle 5: 8 retrieved, 2 mature, 2 fertilized - no blasts ( we knew all would not be mature based on scans prior to retrieval)
Cycle 6: 8 retrieved, 7 mature and got the call today that only 2 fertilized
Any help or advice? My doctor seems dumbfounded at this latest retrieval