Lester
Lackey
Some close to league avg guy x3
And if not Lester, someone close to his calibre via FA or trade. I don't see Cherrington sitting on his hands in the offseason.
The lineup is above league average too. Papi will lose some skill via age but we would expect Betts, Bradley and Boegarts will all progress naturally. They won't be a juggernaut but they'll be a 85ish true talent win team. That's good enough to compete if you get a bit of luck on your side.