Low motility sperm

Adrienne • I`m 33 and trying for my second baby. I`m also incredibly impatient! We`ve had two chemical pregnancies in 6 months.
Husbands motility is at 16.1%. The rest are immobile. Wondering what the doctor will say. His count is at 15.5 million with 20 morphology. Also wondering if we should try supplements or if assisted fertility is our best bet. We already have one daughter together who is three. So maybe we can still conceive naturally. Would love your opinions.