Sounds a bit like the sd-card might have died.
You can first try just writing a new image to the current sd-card, but using a new sd-card doesn’t hurt either.
Writing the sd-card image and configuring it is explained here:
PiAware - build your own ADS-B ground station for integration with FlightAware - FlightAware
If you want to keep the station number, also read this: For Beginners - How to Get Back Existing Station Number in A Fresh Install