Hi . Iam 39yrs Male ! Got Married 5 Yrs

Hi . Iam 39yrs male ! Got married 5 yrs back . Try for a baby but i not getng. After my semen test dr told me that i hv low count level ( 20 smtime 10 . Smtm 25 max ) so dhat to do ??? Dr gave me sm fertisure m & one zinc tab ! I used so many times but no result in count level ! Pl Advise me that what to do ??