Need advice or suggestions

Husband's semen analysis came back fine. I've had blood work done and that has came back fine. Everything is normal test wise for us. It's 4 years of on and off trying between us getting tested and taking ovulation tests months straight. We have even tried taking Evolution60 ans Preseed along with prenatals, working out, eating healthier, cutting back on caffeine and alcohol along with not drinking either of them at all. Has anyone else dealt with a similar situation? If so what advice or suggestions would you give in order to make this easier or what helped you get pregnant? We are also considered healthy along with being at our prime age for conceiving. We just don't know where to go next.