If they bring it back with Bellinger they don’t need an upgrade at DH. One of the outfielders(Suzuki) would be the DH. Also, if they run back Taillon, Steele, Imanaga, Wicks, Assad, Wesneski, Brown, and maybe even Horton I’m not sure they need another starting pitcher. As for the one, they can use a established pen arm. Not sure he has to close. They have some arms in the system that might be able to handle that. I just don’t see them spending on a closer. I can see either Biggie, Hodges, or Brown closing next year. To me the main upgrade is catcher, 3rd base and one pen arm. To me those are must haves. The rest are more like “would like to have” moves.
As for improving the bench, that is just not going to happen unless it happens by a fringe guy having a good year. Teams just don’t spend on the bench. Look at the Braves. Short is their back up infielder. Phillies have Clemens. Clemens has played well this year, not not someone who that was expected to do as well as he is doing. Sure, it would be awesome to have a great bench, but that is more a result of luck rather than having actual dependable good players on the bench.
My last point is if they do lose Bellinger they need to add better than him. And, yes, at that point they need to add a DH or outrider. (SOTO please)!