Ovulation problems

Hi all. My problem is not that i dont ovulate at all but i ovulate different time way different which makes conceiving even harder. For example last cycle i ovulated at cd16, the one before 21 and this cycle i happened at cd26 which made my cycle 39 days long. Its so hard to cover all these potential days especially now that i decided to stop tracking with opks to ease the stress level on my ttc journey and just cover the potentialy fertile days. Its so hard. My partner has low morphology of 10% too and needs at least 1 night off to get his guyz strong.

Any advice on how to regulate my ovulation? I also hv 4 rounds of failed clomid so no medication. Thank you