The Hebrews and Greeks did indeed have a word for a person. It is the word we most often see translated as “soul.”
When the Bible talks about souls it is a reference to persons. For example, when Peter says 8 souls were saved through water he means 8 persons were saved through water.
When Luke writes that 3,000 souls were saved he means 3,000 persons were saved.
The Bible indicates that God is a single soul. He is a single Person.
What an unusual and confusing way for a 3-in-1 Person God to refer to Himself!
Do Trinitarians really expect anyone to believe these are references to a 3-Person Being?
No, the scriptures always describe one person, one soul, individual as God.