Your sentence sounds like "hey buddy, just mimic the Carlsen/Ronaldo strategy and be a great chess/soccer player." At such a high level, where every nuance matters, this is simply unrealistic. Joshua has a different physical condition than Fury and he cannot transform into him.  Even in the first match, against the background of Usik, he looked like a very slow boxer, what will happen if he gains extra weight? I think that on the contrary, he should lose weight a little and focus on increasing speed - perhaps this will allow him to realize his advantage in strength. Otherwise, Usyk again simply outboxes him in smart boxing.