Unlock the screen I phone 16 pro max

If you forgot your passcode, you will to erase your iPhone using a computer by following the directions in this link --> If you forgot your iPhone passcode or your iPhone is disabled - Apple Support

Once you erase the phone and are back in, you'll be able to restore your most recent backup, assuming you have been backing up your iPhone. If you haven't backed up your iPhone, your data will be gone. Keeping the Passcode safely stored somewhere safe to avoid the huge hassle you'll be going through is very important.