We are not able to reset your password.
This is by design. Strongbox is a a zero knowledge password manager, which means that we are not able to access your database or the personal information stored inside it under any circumstances.
If you have been using Face/Touch ID or a PIN code to open your database, you may be able to unlock the database this way. Try this on every device that you have setup Strongbox on. And if this works, it is critical that you immediately change your master password to something that you will remember.
Failing this, there is unfortunately nothing Strongbox support can do for you. Our only recommendation is to try to remember your master password. We wish you luck, and hope you understand the security decisions that we've made.