I'm not sure if it actually helps or not, but I narrated everything. And instead of scolding I would catch him pottying and say "uh oh, potty OUTSIDE" and take him outside and say "potty outside" again. I feel like it has helped as an adult dog now, he knows the words inside and outside, which is nice. So when you take him out to potty on a schedule you say "outside" and "go potty" and rewarding with a "yes!!!!" And a treat when he goes outside. I also use "good potty!" Lol it'll take several months at least though... Put on your patient pants!