What else?

I ttc forever with my ex husband, now me and my bf are ttc, I think my ex wasn't fertile , I've been trying the ovulation strips, taking folic acid, making him take folic acid, having sex when I see the surge, occasionally using pre-seed, lie there, it's been 6 months, im 31 he's 37 and neither of us have serious health issues and no children, what else could I be doing?