Back to the subject of changes needed for 2022, I see the Rays and Jays are already formidable teams and will no doubt make moves to improve still more. The Yankees will try to throw money at their problems, leaving no choice for the Sox but to make significant moves for 2022.
Moon has already suggested the addition of a #2 and #5 starter to back up Eovaldi, Sale and Pivetta. That assumes we may make a QO to E-Rod but then trade him. Also it assumes we will have one or more of Houck, Seabold and Whitlock fill in when the inevitable injuries occur. I agree with Moon on this line of improving the team.
In the case of relief pitching, we have Taylor, D-Hern, Swamamura and Whitlock who I would keep but would be willing to trade any of the rest for a solid closer and setup man. That includes Barnes, Brasier, Ottavino, Richards and Robles. Perhaps we keep some of those, keep some and fill in from our minors program.
Catching is a weakness for us with Vaz not performing all that well. It is difficult to find quality catchers so I would expect the cost in salary and/or prospects to be high.
Our infield has significant defensive issues. Devers is not improving and Dalbec has looked awkward at first. Bogie has range issues. There are drawbacks to any moves which have been identified and discussed. We need to improve the defense while no sacrificing our offense. I have been around and around of this. Could we acquire Trevor Story, Move Bofie to third, Devers to first and bring Kike in to play 2nd? Assuming Dever's could play first adequately, it would be a very competitive infield but Story wouldn't come cheaply.
I happy with Verdugo in Left field, Renfroe has defensive lapses but his arm is very good and his hitting adequate. That would lead us to finding a first rate defensive CF with a decent bat.
We shouldn't try to keep 2 costly DH who are primarily limited defensively. JDM is still good but I would trade him if he doesn't opt out in favor of the younger and equally good Schwaber
My suggestions require the following additions:
1. #2 and #5 Starters
2. Closer and solid setup man
3. Primary catcher
4. Shortstop (here I suggest Story)
5. Quality defensive CF with a satisfactory bat.
6. Keep Schwaber as our DH and let JDM opt oit or trade him
Pretty big wish list with the hope of becoming a leader in the AL East