Trying for 2nd baby

Hi mummies How to get pregnant again. Planning for 2nd baby. Within 5 months still no good news 😔 i am 36. My baby is 11 months. Name folic acid i took hubby took supplements track ovulation all did period is regular. I wonder what is wrong . Yes i plan to get pregnant ever since April n before my baby turns 1 . But it didnt work out.