Can I fix chin reduction gone wrong, what happened to my face?

In general, revision surgery can be more difficult than the initial surgery. In order to provide some guidance, I would need to see original photos and the surgical reports from each surgery. There are ways to correct the sagginess of the soft tissue pad of the chin. More information is needed.

You did not say how your chin reductions as done but, by your symptom description, it probably was done from an intraoral approach. When the soft tissues are degloved and the supportive chin bone reduced, the soft tissue chin pad can droop (slides off the bone) and looks fuller/heavier since the same amount of soft tissue remains. A secondary intraoral procedure usually only makes it worse (or not better) because the same problem persists. (too much soft tissue for the bone that now exists) And you can't just lift the redundant soft tissue back onto the bone. Any further effort for improvement must go in a different direction...soft tissue removal from an inferior submental approach.