Nah, he's not a grown person, he's a circus act.
A freak who employs one tactic mechanically with no creativity or regard to circumstance or opposition (he tries to hit to DJokovic's backhand even though it is his strength), over and over.
That's what makes the guy fun to watch.
He shouldn't re-think his strategy.
Tennis is not a thinking man's game, he should just hit the gym hard, get faster, stronger, fitter, heavier, bigger, more explosive, more flexible and learn to hit both wings with double the topspin he hits now, and even Djokovic's backhand will break down. Don't think up a new strategy, just execute the existing one better.