Hi there ~
I understand your concerns. I believe that you are having problems with your semen analysis
. There is a wide range of normal when it comes to motility of sperm in a semen analysis. I believe that you might have a problem with motility that is congenital or otherwise. It might be best to go in for IVF treatments if you are at the end of your ropes and your wife is also very interested in having a child and has no physical or gynecological problems. I hope you take a joint decision regarding the same.
I hope this helps. Take care and have a lovely day!