To me there have been a bunch of bright spots, starting with Casas and Duran, who surprised most of us with their new found ability to hit MLB pitching. Plus Duran is taking better routes on balls hit to the outfield, and his speed on the basepaths is amazing and productive.
Both catchers, Wong and Wright, have been better than expected. So has 38 year old Turner. Bello--you already mentioned as well as Martin.
Sale had not only his best season since 2019, but it has been better than 2020-22 (3 seasons) combined. I am not saying we shouldn't be skeptical about next season, but am saying we could be pleasantly surprised.
As moonslav has pointed out, the Sox have several capable middle/long relievers in Whitlock, Pivetta, Houck, Crawford, and Winckowski. If the Sox acquire 2 or 3 reliable starters in the offseason, those 5 plus Martin and Jansen would be a pretty fair bullpen.
Your dismay with this team this season is merited because the pitching and hitting overall have been subpar. Ditto the defense. Thus the losing record. However, as moonslav and many others have said, acquiring 2 or 3 good starters would make a huge difference, and the lineup for next year--with or without Duvall, Turner, Duran, and/or Verdugo--should be pretty decent.
Three sniveling excuses for this season: 1) lots of injuries (Story, Duvall, Paxton, Houck, Whitlock, Sale, Duran, Casas, Reyes, etc; 2) killer schedule Aug 4-Sep 20 when the Sox played 48 games with just 3 days off; 3) team payroll was/is ranked 15th in MLB, the lowest team salary ranking in the John Henry era and probably in the last 40 years.