Recover lost app with download or .aab file?

I could've sworn that I saved the app but when I logged into my account this morning all my projects were gone! I really need these files.

I still have the app downloaded on an android phone, and I have the .aab file from it. Is there anyway to recover the project with these?

Did you use the same server (ai2 or code) ?
Did you use the correct login details / email address ?

MIT can usually recover accounts if they have "gone missing"....

For the future, it is essential, good practice, to routinely export your projects as aia files to your computer as backup.