Access Nextcloud from anywhere by port forwarding using public IP

My config file is configured like bellow :

'trusted_domains' => 
  array (
    0 => '182.*.121.82',
    1 => '172.16.15.5',

  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'sqlite3',
  'version' => '22.0.0.11',
  'overwrite.cli.url' => 'http://182.*.121.82',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'tls',
  'mail_sendmailmode' => 'smtp',
);

I forwarded port 80 & 443 by mikrotik router but I can’t access from outside of my office. Tell me if have any other configuration which I missed

Thanks in Advance