Fire the manager, don't fire the manager - it's irrelevant. Managers mostly make Ty France level wages, that shows you the impact they make to the game. Shake it up, do whatever makes you feel better from the couch - I'm going to focus on talent:
The idea that the Twins have blocked Larnach and Julien and Miranda and whomever else just doesn't pass the smell test. Wallner? 100% yes....bad roster management. Larnach was up getting plenty of run and managing a high of .231 and 8 hrs. He just didn't deliver enough to stay in the lineup. Eddie Julian can't field and last year his at-bats were nothing short of painful. Miranda got a long run, hit like a beast, and then completely cratered.
The problem isn't opportunities....the problem is development. We are not developing our hitters to handle the big league level with the bat or the glove. Feel however you want about Rocco, but the fact he has to keep running out a lineup of stone-handed, plodding oafs in the field is not his fault. The fact that these hitters - on their 81st hitting coach - can't hit isn't on Rocco.
This is pure organizational failure to develop every day players. We aren't drafting athletes. We're not training those we draft to master a position and field it well. We aren't training them for the adjustments and challenges of the big leagues. We're going on 5-7 years now without a true impact player being developed.
You want to point fingers - start there.