Not sure what your definition of "tweaking" is, but the Steelers have some major roster moves to make.
First, decide on QB. More than likely Fields on a 3 year deal.
Figure out the WR room. Either keep Pickens, and add a #1/1A to supplement him, or trade him and sign a top FA WR and pick one high in the draft.
Move Jones over the LT, get him healthy and see if he reaches his potential.
Find a RB replacement for Najee.
Add another top CB either by trade, signing or draft.
Get younger on D line.
Don't expect any major coaching adjustments because they never do, but personally would move Austin out. They won't but should.