Creating a custom email with iCloud, without @icloud

Through my existing iCloud/Apple mail system, I would like to create/use (if possible) an email address for my new business (info@mydomainname.com) without adding an iCloud alias to my existing "myname@icloud.com" Apple mail system. Having "@icloud" at the end of an email does not present well in professional circles. Thank you

I am "attempting" to set up a website using Squarespace, but have discovered that the only way to have a "custom" email address is to add an extra monthly fee to incorporate GSuite, which does not work with my apple ecosystem (calendars, contacts, etc.)

Thank you again for any help/suggestions !