Yelich won MVP last year despite having the 12th highest GB% in the league.
Small sample size, but so far this year his GB% has gone down 4% from last year, and he's elevated his launch angle from a paltry 4.7º to 13.7º.
He was able to be successful last year because despite hitting the ball on the ground so often, his hard hit percentage was pretty elite. So far this year it's even higher. If he continues to elevate his bat plane and hit the ball in a similar way that he did last year, he can be even better.