Two years of trying with PCOS on your side and asthenoteratozoospermia on your husband's side is a real combination that usually needs an active plan, not more waiting.
Next Steps
Discuss with your fertility specialist whether another round of IUI makes sense given how the sperm parameters are affecting things, or whether it's time to talk through IVF or ICSI even if you're not ready to commit yet.
Health Tips
A failed IUI cycle doesn't mean nothing worked, it just tells your doctor what to adjust next.