The struggle of praying for a baby

Alyssa • Married 3 years; step momma to 1 ❤️ TTC 4 years PCOS 6/15- miscarriage 1 11/15- miscarriage 2 1/16 miscarriage 3 1/23/16 Twins/ miscarriage twin 1- 4/1/18 twin 2 ectopic -4/7/18
I miscarried last January after trying for two years. A year later and we are still trying to concieve. My doctor just told me that I only ovulate once every 3 months. Any tips on how increase our chances? Or has anyone else experienced this?