What I liked this season was the improvement in his defense and playing within himself. He was trying too hard last year and to start the season, ended up making bad fielding and baserunning plays, including the one that injured his shoulder (running through the third base coach's stop sign, getting out and hurt all on one play).
If he can find a way to stay healthy, he should be OK. That said, I want an upgrade in infield depth from Mendick/Garcia, someone you'd feel comfortable with filling in the middle infield, possibly also 3rd base, for a few weeks and not fret about either side of the equation. The Sox should be fine in the OF, but need more depth in the infield across the organization. They made a good step with this year's draft, but it will take time for these players to work their way through the system.
The one true "need" for the post-season, or to survive the stretch to get there, are relievers Tony is going to use. You are already postponing Kopech and Crochet's development for yet another year out of desperation because you weren't willing to spend to bring in a few solid set-up men this off-season.