Yeah, obvioulsy the team Breslow inherited is really bad defensively. With the trade of Sale it looked like Breslow was going to honestly address the team's structural problems. A bold move in that direction would have been to acquire a good fielding third baseman (say, Chapman, who also satisfies the need for another RHH bat), moving Devers to DH, and then subsequently trading Yoshida (though maybe there are no takers??). These moves would be "getting real" with the team's foundational problems, one of the biggest being that the dude with the biggest contract is an absolute butcher.
Wong, Casas, Grissom, Chapman, Story, Duran, O'Neill, Abreu/Ref, with Devers DH and Rafaela all over as needed could have been pretty nice.
Short of that, the next issue of needing RHH power bat could still be addressed by acquiring Soler as DH, which would mean shipping Yoshida. Doesn't improve the D any further, but at least improves the hitting line up and provides more L/R balance.
Wong, Casas, Grissom, Devers, Story, Duran, O'Neill, Abreu/Ref, with Soler at DH and Rafaela all over as needed could be an improvement.
EDIT: I'm more in the camp that - health provided - acquiring Soler and Montgomery or Snell would push the team into WC contention. Could do that and likely stay under the tax (though maybe that would require moving Jansen or Yoshida) ...making those moves seems pretty simple - it just costs money, and really truly wouldn't jeopardize the future.