Male infertility

CP
We have a 3yr old, & being trying for almost 12 mths for baby #2 with no luck. I am over 35 & husband 11yrs older. Have been to specilast & had some tests & am good for my age. however husband has slow swimmers & doesnt make enough to get to my egg. we r needing to know any ideas to improve both if these for hubby. we just know about diet, exercise & menevit. anyother helpful info would be good. we r trying out supplements fir 3 mths otherwise will have to be ivf :( as u can imagine hubby is disappointed & frustrated. thanks for reading.