Any advice on Low Motility on SA

I wanted to get some feedback if possible if anyone has experienced low motility on a SA from their SO and has still conceived without having to seek a fertility specialist. A bit of back story, been ttc to conceive almost two years and SO was told his progressive motility is low. Just trying to see if there is anything y’all did or they took such as vitamins, pills, anything that help to get that % up would be so appreciated. I just want to see what we have to do next and if considering a fertility specialist is our only option.

Thank you!! :)