They are 9th in pitcher BB%, 19th in hitter K%(half a percent from being top half), and 12th in hitter IsoP, none of these are gaping flaws in the team right now.
It seems pretty clear to me that the team is better than it's record, and while that's cold comfort since they probably aren't good & lucky enough to overcome that gap over the course of the season, it does mean we can be more clear eyed about what's going wrong and what the way forward should be. To me there's three main problems outside of things that boil down to luck/sequencing:
The starting pitching hasn't been elite recently, so instead of potentially carrying the team it's shining a spotlight on other failures at the margins. In the first 23 games there were 4 starts with 4+ runs allowed and in the last 23 games there's been 7. This mostly boils down to the depth being tested and Taillon being horrific. If he can get sorted out(and there's no other path to try here given his contract) then this should be something that resolves itself. Hendricks avoiding disaster starts will be very important too, because I suspect he's going to get at least as long as Wesneski to prove his rotation worthiness.
The position player depth has failed. Madrigal(though he deserves way less fanbase flak), Mastrobuoni, Hosmer, and now Mervis have not hit, and combined with the weird roster composition(I harped on needing LHH all winter for this reason) means that the offense is very good when it is whole but middling when inevitable trials are faced(Bellinger/Hoerner injuries, Suzuki/Wisdom slumps). Morel helps with this a bit but it's still a group with too much skill set overlap, particularly in its right handedness.
First base and DH are black holes. This is related to the position player depth but I want to call it out specifically because these are positions that are supposed to help with consistency and stability in an offense, but they are bottom 5 at both spots offensively. Hosmer got a lot of ire for this but Mervis has been worse than even tempered expectations, particularly in pitch recognition. Mancini has floated under the radar but he's been bad too. Hopefully Morel keeps hitting and then once Bellinger is healthy you can start helping out more with Wisdom or even Velazquez if Mancini/Mervis can't get it going, but otherwise it's the singular spot on the team most ripe for external improvement.
The pen might feel like a peculiar omission here, but I think it has the easiest way forward given the shuffling that's already taken place. It's also the spot that feels the most luck-driven(bullpen ERA is underperforming FIP and xFIP pretty dramatically) in its cause.