Been there done that with my non league club.
In your favour is that no one in the league will want you to go bust as it messes up the league in many ways. Your supporters trust (if you haven't got one set up then it needs doing urgently) will get a ton of support and advice from Supporters Direct who are massive in the game now. Finally, anyone with money who may want to come in and help will probably leave it late to see where else money will be coming from. Show their hand too early and everyone else steps back and let's them take the risks. You need as much publicity as you can get. Local media of every kind and the regional media as well. Unlikely you will get much nationally without a 'good' different story.
Losing your club is awful as I know but you fight every inch of the way, include as many people as you can, see what skills and expertise you have between you and start collecting and raising as much money as you can but don't just put it into a financial black hole managed by whoever runs the club now, hold it back as a bargaining chip for later.
The bottom line - you've reformed once you can do it again. Someone has a football ground without a tenant = equals no rent!
It''s a long hard road but there are now success stories through most of the leagues from the Championship downwards. Look at what is now 1874 Northwich to see what can be achieved or, much higher, Swansea, Exeter, Wimbledon, Telford - I could go on and on. GOOD LUCK