forgot my iPhone password

See this article.

If you forgot your iPhone passcode, use your Mac or PC to reset it - Apple Support

… or perhaps this one.

If you see a iPhone, iPad, or Apple Vision Pro unavailable message or Security Lockout screen - Apple Support

Resetting the passcode will result in the data being erased on your phone, so hopefully you have a current backup of your phone on iCloud or a computer.

If you don't have a backup, then hold off on resetting the passcode for now in the hope that you are remember it to avoid the reset process.