Verdugo sucks against lefthanders. It makes sense to look for a 4th OF next year who rakes against lefties and can play LF. I thought M.Wilson might be that guy but the Red Sox weren't interested in Wilson obviously.
Maybe you don't need to bring someone new in and instead play Kike in the OF against lefties or something like that.
As far as Duran goes, I have him playing everyday next year, starting in CF, and batting ninth. He may need a few months to adjust to major league pitching, but I would invest that kind of playing time in him.
The Devers situation is tricky. He is awful defensively, but I'm also worried about his defense at 1b.
I would probably go with this next year:
1b: Dalbec (but I would also shop Dalbec to see if some team, with a hole at 3b, will overpay in a trade for Dalbec).
2b: Hernandez
SS: Bogaerts
3b: Devers
C: Vasquez
LF: Verdugo
CF: Duran
RF: Renfroe
DH: Schwarber
Against lefties: Arroyo plays 2b, Kike goes to the OF, and Verdugo sits. Against RHP, Arroyo would be used as a super-utility guy.
Sure, my infield defense remains weak, but my OF defense is very good.