Lots of teams have a big falloff one year after winning a title.
Cora was obviously concerned about the starting pitchers who pitched on abnormal schedules in the 2018 postseason, with relief stints between starts. His rest program didn't seem to work, but who knows if the alternative would have worked either.
But that goes to Cora's supposed main strength; he's a motivator that guys love playing for. Whether or not that's true (and it seems to be), it only becomes valuable if there's a result from it. Theoretically that result is a motivated and synergistic clubhouse, which paired with Cora's "regular time off regardless" approach, would lead to a committed team playing sharp baseball deep into the season. (Being well rested, motivated, and not pestered with trivialities.)
Cora had a great year in 2018 where he got out of the team's way for the most part. He had a very good year in 2021 (skin of the teeth, but results count). He had a neutral year in 2022 (injuries overwhelmed the team). He had two bad years - 2019, where he couldn't motivate the team to play at all, and 2023, which was aimless, blew key games, and absolutely quit down the stretch. (Additionally, nobody would characterize the overall play of the 2023 team as well-prepared, or sharp, or savvy, or even fundamentally sound.)
Other than that he's pretty average. His handling of the media is good, but there's only so much one can do (witness the constant negativity this year.) His tactical handling of the club is a very mixed bag, with the bullpen use being mechanical (at best), although he's picked up his PH and PR tendencies this past year.
Strategically, we go back to the previous paragraph - mixed bag. He almost never "steals" a winable game by coloring outside the box, and instead hopes things will come out in the long run, which is pretty much a couple weeks after the trading deadline instead of well before it. (Hand in glove with this is a key weakness is playing marginal players for far too long. Although some of that is on management and coaching/scouting, Cora never seemed shy about letting a go-nowhere guy fail miserably in a big moment.) But a handful of extra wins in 19 or 23 might have resulted in some trade-deadline acquisitions and a late season push like we saw in 21.
I think he's smart enough, and may have enough of a sense of urgency, to manage the 2024 team well enough.
But a slow start, punctuated by "Disappointed with the results, but positive signs, specific AB anecdotes, nicknames, and tip your cap, and we're better than this - just wait till we're back east" press conferences wouldn't surprise me at all.