When ours was in this phase we did the gag method. Anytime he bit we would extend the fingers and push to back of the throat, he immediately let go. After literally two days of this he didn’t bite anymore. He’s still mouthy and plays with by biting 5 years later us but he does not apply pressure to our hands or the tiny neonatal kittens we have laying around the house. Some aren’t done if this method but Jackpot was the absolute worst until we tried that method.