Success rates of IUI depend on many factors like age of the couple, sperm count and tubal patency etc. To increase your chances, you should follow some tips in to increase your chances of getting pregnant i.e.
Men should abstain from ejaculation for 3 days before the IUI procedure that increases the semen.
Don’t take High stress or pressure.
Eat Healthy and Exercise Regularly, If you’ve not been able to conceive after 3 IUI cycles then consult to your Infertility Doctor.