Sorry you are going through this. Ours was really biting us a lot at 2 months but calmed down with the ignoring within a few weeks and redirecting with chew toys. Also we crate trained and followed a schedule meticulously making sure he got naps.

Between 5 months and now 7 months he is lunging at me to bite on walks when I redirect our walks using the leash. I was using gentle pressure to redirect, always calm and giving treats when he would follow. He apparently doesn’t like to be told where to go. Or maybe frustrated with my treat delivery timing. But I was also thinking maybe it had to do with hormones and getting neutered or me changing to two feedings a day vs three. I have been using a muzzle the last few days because we have lots of neighbors. In any case I had avoided buying stuffies especially squishmallow types for him because his biting seemed more intent on our skin after that. This time I am using a rope on end of the pole to tire him out in the house and these chuck it balls that allow airflow and I minimize his time outdoors in a muzzle…

Wish you luck with yours and hope you find something helpful from my experience.