I mean, if it were me, I'd move Moncada again, sign Rendon, sign Grandal, sign Strasburg, and sign another quality pitcher, say Keuchel. It's not ideal, but the talent at RF on the market isn't going to help the Sox be competitive, certainly not nearly as much as moving Moncada to RF and signing the two best position players on the market. This lineup and rotation could compete in 2020:
Lineup:
01) 2B Nick Madrigal
02) RF Yoan Moncada
03) 3B Anthony Rendon
04) 1B Jose Abreu
05) LF Eloy Jimenez
06) CF Luis Robert
07) C Yasmani Grandal
08) SS Tim Anderson
09) DH Zack Collins (or pick someone else for this spot)
Bench: Leury Garcia, Brian McCann, Danny Mendick
Rotation:
01) Stephen Strasburg
02) Lucas Giolito
03) Dallas Keuchel
04) Reynaldo Lopez
05) Dylan Cease
With Kopech and Rodon eventually available to replace any ineffective pieces.