Definitely need another top starter who can slot in right behind Cease. Ideally, they need a 4–5 WAR type of arm - someone who gives the rotation another legitimate front-end presence instead of just another mid-rotation piece.
SP depth is also huge, as we’ve seen. They probably need to add a few rubber-arm types who can eat innings, and maybe even roll the dice on some injured vets who might miss the first month or two, with the hope they rehab successfully and return mid-season.
If Varsho departs, CF becomes a major hole. I’d be fine bringing him back on a one-year deal if the AAV is reasonable, but if that happens, they still need to add an impact bat somewhere either in LF, DH, or both.
The bullpen should be easier to address, assuming they don’t trade Varland, Hoffman, or Rogers. If those three are still here, the late-inning foundation is already pretty solid. They could probably use another LHP to pair with Fluharty, but compared to the rotation and lineup, the bullpen feels more manageable.