As the person in charge, how to quickly take over an existing solution and push the product to develop again?

Recently took over a new product, a complete solution that has been delivered to use. Previously affected by the policy, the project was scheduled to be abandoned and has stalled for some time. Consider restarting the project in the near future.

As the new person in charge, on the basis of only a few maintenance personnel, how to push the whole situation to run, complete the new product construction, team building and self-construction?

Present situation:

Goal:

0. Cost Benefits

1. Risks

2. Management

3. Manpower

4. Technology

5. Market

6. Operations

(not to be continued)

As the person in charge, how to quickly take over an existing solution and push the product to develop again?