I'm more familiar with the far end of the DID spectrum with very dissociated parts, so this may not be useful to you, but for some with DID it can be helpful to develop an inner world that is strongly visualized. Similar to a "safe place" in the mind, it might be a garden, cottage, mansion, clearing in a forest, whatever you would like. But it makes a space where inside people can come to talk to you and to each other. When someone is not in the safe place, they are in the nothing, the dark, the shadows, the mists, it depends on how the person visualizes it. You may have no sense of them at all then, or you might know they're still there, but they seem far away. You might or might not be able to ask them to come back to the meeting place.

When my person first created an interior world like this I think they found it very peaceful to have.