If you have an MS 365 subscription then just go to your subscriptions and download the latest version. You'll need to remove the old version first.
If you don't have a subscription then either get one, they aren't expensive for the entire 365 suite, or buy a commercial license for the latest version. Then uninstall the old version and download the new one.
There is no "free" option for a newer version of Office. That would be piracy and it is illegal.
Please NEVER post personal information such as your email address in posts. I'm flagged this as containing sensitive information. Please edit your question and remove your email address.