There is reason to expect positive regression. The team won 93 games without anybody having an uncommonly good year (aside from Devers). If you go through the lineup positions.
C: Leon hit like a backup. Vasquez was by the end of the year his most likely best case scenario - pesky hitter to get out, but largely an empty .270 sort of dude
1B: Moreland has meh on base skills but can hit 20 HRs. Right in the middle, maybe better than that - of what you could have expected.
2B: Injuries, injuries.
SS: Bogaerts struggled. How much of it was injury related? I think a lot - but it is an open question.
3B: Devers was a revelation clearly.
LF: Benintendi was fine. Not amazing, but clearly good.
CF: Bradley was a mild disappointment but this is probably what he is. A bit of a three outcome player who fields well enough to support it.
RF: Betts was an MVP level performer - but yes dropped off a bit at the plate.
DH: Ramirez was probably what you'd expect from him these days, but not very good.