After a long time I didn't use the app and now I've forgotten the main password.

What can I do?

As with most password managers, if you've forgotten your master password, your out of luck.

https://www.enpass.io/support/kb/master-password/i-forgot-my-master-password-how-can-i-reset-enpass/

Hi @iMac,

Sorry for the inconvenience caused to you.

Sorry to inform you that there is no way to access your data without your master password and if you have forgotten your password, all your data is lost.

This is to ensure the best and optimum security for your confidential data. To use Enpass again, you need to reset it on your device and start new database afresh.

Thanks!