You will find enough examples of people turning their sorrow into an opportunity!
Will it be easy. Absolutely not! Will it be impossible? Probably not! The task will be very difficult, but not impossible.
You want to start by creating short, medium and long-term goals with your team to get them engaged and committed. This will be followed by working on the roadmap with timelines to go from where you are to where you want to go taking into account the prevailing conditions. Here some assistance from people who have been there and done that can be extremely valuable.
Once you have clarity of goals and road map then execution is the name of the game. Follow this up with periodic evaluation and constructive feedback to and from your team.
With the above approach, you will be up and running with no time for brooding.