I lost access to my own file! My personal account do not belong to any team at all

Very frustrating….I did nothing and a warning sudden pop up. The file tab automatically disappear. It’s not in trash either.  
What should I do now?
I lost access to: https://www.figma.com/file/rL3TA1oinJin6i5R3MbWYr?fuid=565700342330813971