When I recovered the first project about 15 years ago I did not know this kind of projects are called ‘troubled’. Couple of years latter I enrolled in a training called “Recovering troubled projects’ by PMI where the ‘Aha!” moment descended upon me: “this is what I did! I recovered a troubled project!”
Here are the basic five-step approach, which I tried and tested on numerous projects since then:

Recovering a troubled project requires twice the effort and the commitment on all sides: the team, the sponsor, the client. It requires trouble-shooters abilities. The project manager will also have to deal with the low-morale of the team, if the team is still there. Or if it’s a new team – unknown dynamics will have to be dealt with.
If you are looking for more inspiration:
- WHEN THINGS GO WRONG …RECOVERING A TROUBLED PROJECT, 8 October 2012 by David L. Hamil, PMP, MBA http://pmi-nac.org/images/downloads/NEW__/recovering_a_troubled_project.pdf
- CHANGE MANAGEMENT, Leading Effectively When You Inherit a Mess Ron Carucci, AUGUST 07, 2017, Harvard Business Review