Hi @Tilly177
If you used Clomid last time, it is highly probable you will have to use again and should asap given you are 10 years on since your first one.
Given your periods are regular, you may only need Clomid to help boosting your hormones.
I would be more concerned about your DH previous low motility as that points to some underlining cause significantly affecting his sperm. It's great he's got it back up to 30% though, that's good news.
If you don't have any success after 6 months of Clomid, I would recommend IUI for laboratory assistance to concentrate his sperm quality.
Regarding supplements, nothing (incl soy isoflavones) can replace Clomid which I suspect is all you need. Other than Folic acid, just keep eating super healthy and do some fun / regular exercise.
Myo-insotol is a highly effective supplement however it should only be taken at the direction of a Specialist after they review your tests results. It's great for women with PCOS however it may not have the right effect on you.
I beleive as long as your DH keeps doing whatever is working for him, and you get back onto Clomid, you 2 should have a nice surprise sometime soon.