Anderson SS, Haniger RF, Bassitt SP, Barnhart C... all could help, but won't win rings. Kike -- if he doesn't make a great comeback this fall -- may be re-signable for a year plus option, but his hip ish may force him out of full-time CF; that could mean another look at Duran, or even a mid-season promotion for Rafaela, if his rise continues to be unstoppable.
D is the key to escaping mediocrity. Here's the scouting report on Red Sox 2021 Defensive Player of the Year Rafaela, from SoxProspects.com: "best position is center field... in the outfield has really good instincts... takes really good routes... plus arm" -- does any of that sound like Duran? Ceddanne currently has 52 XBH in 88 A/AA games... compare with Mookie's last year in the minors: 46 XBH in 99 AA/AAA games. Granted, Rafaela has yet to play Triple A, but the trend is to discount any stats produced in Worcester, anyway.
As for recruiting a guy like Diaz, Bloom has shown consistently he'd rather build his own bullpen on unknown or retread bargains. The lone exception was Barnes, and that lesson could be a never-again moment for this regime.