I believe the soul as commonly defined to be a subset of our thoughts merged with some overarching subconscious thoughts that are manifested as drives. The reason I feel it's a delusion is I think parts of the whole are missing so it's much more like a cultivated garden than something wild like a forest that I think it truly is. Those drives manifested from subconscious thoughts I think are probably actual thoughts in the true soul. For me elements I wasn't aware of emerged when psychotic and they are things which likely were carefully pruned away to fit with a modern worldview...but they are still there....still part of me.
The thing is I these days belive the soul is mortal and in some ways a trick of the brain to give a sense of unity when our thoughts are more likely discordant and competitive vying to be the one that's acted upon.

Tldr: what we often think of as the soul is likely just the surface of what I consider the true soul, a wilder untamed thing.