most solutions in boxing are simple in principle, they might be hard to implement but they are simple in ideation. I remember I had a buddy who was sparring Maurice Smith, getting jabbed, complaining about it afterwards, I told him all he had to do was not parry but slip it, he was parrying it which would have been fine with someone his size but wouldn't work with someone that much taller. slipping also leaves your hands free to punch. A lot of it is mental really, but a reach disadvantage against someone good at using his reach is a true disadvantage. Just look at tyson when he lost a step, he knew all the tricks but didn't have the reflexes anymore. You have to use more energy to, you have to go to him, you have to take punishment on the way in, it really can be a disadvantage.
