I need advice

I got my sweet puppy around 4-5 years ago when he was still a puppy, I hadn't yet gotten any of my diagnoses other then generalized anxiety disorder and persistent depressive disorder (later both classified as PTSD), he is now older and he is a notoriously stubborn breed but I desperately need to train him, he got his service dog papers a few months ago and we are actively training him, he is supposed to be a PSD (I.E. he needs to: apply pressure, guide away from triggering situations if Im disassociating and don't have someone there, and alert to an active situation) and be able to sense my (severe) migraines, which has been a struggle because for some reason they have abruptly stopped, so far he has learned "kiss" where he basically presses against your face, its super cute and its a good form of simple pressure therapy, and "sniff", where he will come up and sniff whatever I am holding. My main issue is he pulls, A LOT, he is 70 pounds and strong and its one of my biggest issues, that and he barks a lot at other dogs, its because he wants to play because we didn't start service dog training early. Any advice that I can't get on Google or something specific would be super, ABSOLUTELY lovely, please and thank you, I love you guys and thank you.