This may be the time to check that the team members are still in tune with the main things.

Take some time to answer the following questions together:

Stakes
With your team, what would you like to improve or make possible?

Target
In your opinion, which users are concerned by these stakes?

Problems
What are the problems encountered by users that your team would like to solve?

Existing solutions
In your team, what do you think of the solutions that already exist?

Solutions considered
What would your team like to be able to promise users?

You can use the attached "Project Compass" template.
Work by iterations, be precise, reformulate, eliminate, prioritize...