The title for The Open Doorway was probably about the fifth I'd considered. The original title being Child of the South. I hummed and hawed my way through a few more, each increasingly complicated, contrived or obscure. The biggest mistake I think I made was asking too many people their opinion, or likes and dislikes, which had me running in circles and coming up with zero.
In the end, I think the author has to please themselves and go with what their gut instinct tells them. The Open Doorway is relevant as the novel goes on, and fulfils exactly what I wanted to convey in both theme and mysticism. I believe it took me until the final draft to finally make up my mind....but being a Libran, that's not surprising.