recovering lost audio after exporting

(audacity 2.0.0 on Windows 10)
I was working on a project on multiple tracks and saved it but when I was trying to export it to mp3 something crashed and it didn’t save the mp3 file. when I try to open the aud project I get errors, tho there are about a hundred files saved in project_data folder. I tried using the audacity recovery utility but somehow it didn’t work and I got errors.
how can I recover my project from these aud files?