The EV is what worries me. He's at a career low 87.1 MPH average EV for the year. That's the 16th percentile in MLB. His hard hit % backs that up. At 31.2% he's in the 11th percentile. Basically, he's not hitting the ball hard at all.
If you look at him from June 1 of this year on, his average EV is 87.2 and his hard hit % is 31%. Basically dead on with what he's done all year. So his contact isn't really improving much.
On the good side, he's striking out at the lowest percentage of his career and he's still a very good defender according to OOA and his arm is also extremely good.
I just don't know if a guy like Bellinger can be consistently successful hitting the ball so weakly.