I'm going to assuming that we are out on Ryu and Keuchel, so I would be looking to add Alex Wood and Taijuan Walker.
I believe that Wood should be one of the Sox main focus. He is only 28, and if you take out his 2019 injury riddled year, he has had pretty good numbers. Not only does he have a good history and that he is a left, but he can be thrown into the bullpen once our rotation does eventually get healthy and fills out. While with the Dodgers, he has a lot of experience as a long innings reliever. I think this would be huge for us.
As for Walker, I think we should take a flyer on him. Yeah, he hasn't thrown since 2017 where he only threw 157 innings, but he has great upside. Not to mention, Kopech will be on an innings limit. So why not pair them up essentially and have them split the 200 IP over the season?
Yeah, Walker is an upside play similar to Mazara, but who are we kidding? We all know Jerry & Co. isn't paying up for premium talent. So why not cross our fingers and hope we strike gold somewhere?
Edit:
I also think we pass on RP's this year. With RP's being so volatile, why invest money into them when we know we won't be truly competing this year. If we spend money on the volatile RP's this year, Jerry will hold onto more of his dollars next year for when we truly need it.