TTC help please...Low morphology?

His sperm analysis was amazing but the morphology was 3.5... the ideal is 4. they said it’s barely low but that can be what’s preventing it. we been ttc for a year now plus. I see stories on people concieving with 2%! I don’t get it. I got tested as well everything was amazing. Someone please tell me what gets morphology up? Fertilaid is what we’re planning on turning to.