Dog poop on grass

Wondering if anyone has any advice... so my partner has never been very good at poo picking the garden and our grass is just patchy and horrible with all places where the dog poop hasn’t been picked up. My grass is pretty ruined, is there anything I can do about this? It would be nice to be able to let my son in the garden this year as he’s just turned 1 but there’s no way I could atm

Don’t judge me for the fact that dog poo was left out in the garden please it’s already done and I just wanna try to fix it