This piece is lying near my easel, so I often pick it up after working on something else and being all warmed up already, I find something new to adjust in this piece. It may be a bit like polishing, well, a thing that shouldn't be polished, but I do enjoy seeing how a few bold strokes here or there can completely change the focal point, or the mood, the relationship of shapes etc.
In other disciplines I've discovered that this path is often fruitless, in terms of arriving at a finished piece, because of some major structural flaw. A boring song, a poorly conceived photo, even a bad pasta sauce. It can't ever really be saved. Better to just start anew.
However there is a lot one can learn in the process of making adjustments and seeing what happens. Especially freeing if you know you're working on a piece that may never turn out right. You can't ruin a disaster. The knowledge gained can then be applied to other projects, even if it can't save the patient at hand.