NOA to Cryptozoospermia after varicocele repair

Diagnosed with NOA, low T and large grade 3 varicocele. FSH mildly elevated (10). Inhibin B 60.

T normalized to 600s on Clomid and Anastrozole. Still NOA after 4 months.

Underwent varicocele embolization.

3 months after embo, semen analysis showed 1 motile sperm before and after centrifuge.

What are chances of success with extended sperm search? How many sperm are typically needed for successful ICSI?