The Lord’s Prayer begins with the address, “Our Father, who art in Heaven.”
An intellectual could address, “My higher self, residing in my highest consciousness”.
A Naturalist might look to, “Source of the Life Force within me and all of existence.”
A realist might get even more existential, “I now focus on the pure BE-ing within me and all that is.”
Another idea, use the title “God” as an acronym for “Good Orderly Direction,” as suggested in 12-step circles. It continues with what could be considered a title, “Hallowed be thy name”, or an acknowledgement of authority, power. “Whose name I do not know” was used by Tom Hanks’ character in "Joe Versus the Volcano," written by John Patrick Shanley. I’m sure it’s okay to borrow it.