Whoever buys the airport needs to start small and slowly work up.
Look at the local airfields that are around such as Wellesbourne and Leicester, well run, small staff numbers but successful. Coventry needs to adapt that approach to begin with to attract all the aircraft that ar annoyed or have left Coventry.
Once this has been done then maybe try and attract more in the way of Bizjets and Cargo, but at the right price.