Get some post-its and write down each feature. Organized on the 2x2 with these axes X: "risk/complexity" Y:"desirability" (that's business & customer desirability.)
Setup a meeting with your products owner and others to try and get a good deal of feedback and communication, reorganize the 2x2 matrix during the meeting to build understanding of risks and priorities.
With everything on the table the big risks should be clear and addressable. The product owner will be able to make some changes to the product plan.
Visibility and transparency is key, don't do an ass covering exercise, and act sooner.
Make sure you understand what has been difficult and outside the teams comfort zone, where improvement could be made etc.
Also be aware of the motivations for the product owner and empathize. Build & strengthen that relationship.
Better feedback loops, better clearer/slicing of feature requirements... I could only generalize, but aim to improve communication and even if all goals aren't met it will be a healthier place and contingency will be easier to work on.