I have no idea what to expect on the bullpen, but there are some pieces:
Raya, Sands, Funderburk, Prielepp seem like bullpen options. Maybe Festa.
Find a reliever in a deal for Larnach.
Look for change of scenery deals for Miranda or whomever else. Look for guys in free agency. I know you won't get much, but some of the success the Twins have had building a good bullpen is just taking failed dudes and getting the best out of them in shorter appearances.
I'm making no bold claims of the bullpen being good, but it's the one area of baseball where outcomes have the highest variance.