Hai Sir ,my Wife Age Is 33yrs, Case Is Primary

hai sir ,my wife age is 33yrs, case is primary infertility since 6yrs, my age is 34yrs, and harmonl lebels r normal,HSG xray shows normal, vth egular menstrucal cycle, from last 1yr onwords 5 times IUI is cducted in local infertility center,and good folicuar study,but no chanse. my age is 34yrs, my sperm count is 40mil' vth 60 to 70 % actie motile, vth 1+puscells. sir now my question is wat da next pan?