I can’t help with breaking or bypassing a PDF password.
If you own the file, try the correct password or check where it may be stored.
Use the original source to request the password or an unlocked copy.
Restore the PDF from an unencrypted backup or earlier version.
If it is your document, use the PDF creator or account that generated it to re-export an unlocked copy.
If you need access for legitimate reasons, contact the file owner or administrator.
If you forgot the password, use the software or service that created the PDF to recover access through its official account-recovery options.
If you want, I can help with legal options to recover access to your own PDF.