Anything that improves your fertility level will also help. My mom being a case in point (or rather, my step-dad). Six years of trying with his first wife (all failed, secondary infertility after one child) led to a divorce for them, after which he met my mom. She has very high fertility (first try kind of fertility, and no-try kind of fertility, as I was conceived with a copper coil IUD in place). Three months of trying (not even doing the ‘wait four days between tries to get the highest sperm count’ thing, either), and she was pregnant.
He later remarried (again, to a younger woman), and still with a ‘too low to have kids’ sperm count, proceeded to have two more kids. The infertile-due-to-low-sperm-count guy then had to get snipped to keep from having more kids.
The first ex was overweight, but otherwise normal (as far as they could tell at the time, this being 30 years ago). My mom doesn’t remember what my step-dad’s count was, but does recall that they did not think it likely that he could have more kids, even with my mom. They went beyond the normal ‘wait’ zone, too, in asking them to abstain for four days at a time instead of three.
The only thing remarkable and similar between my mom and now-ex-wife-number-three (with whom he had the two other kids) is that they both have strong reactions to hormones - preovulatory interest increase is high. So they time things really well (or poorly, depending on whether they were actively ttc) just by their degree of interest and reactions. No idea if either of them have particularly favorable CM/CF, though. (Just that much info was TMI for me, I really don’t want to ask for more…)
But my lesson learned: Anything that gets more swimmers to the goal on time is of benefit. So you can ‘help’ along with him by doing things that generally improve female fertility, if you want to make it feel more like a paired burden than his alone. Taking Charge of Your Fertility would be my resource on that.
I also know one other guy who had his ‘bag of worms’ repaired (large varicosity problem in the scrotum). He had a reasonably normal ‘trying’ span post-repair, and now has a nearly-1-yr old. No idea what his sperm count was, before, only know that he was told he might have trouble due to the varicosity, and had it repaired.
Hope the urologist finds something easy to fix, like varicosity. The bounce-back count on that one is pretty fast, IIRC.
Best of luck!