I'm also the host of my system and I use the term "frontlocked"--I can't really leave front/co-consciousness. I only see the headspace in bits and flashes, so I don't know how to help you get back there, but I do have tips on communication. For us, the best way is to record it somewhere, like, we write notes to each other on the sides of my school work or essentially "text" each other on my phone

^ I do that same thing. I have a personal Discord server that I use to communicate with everyone

We haven't got much of an inner world ourselves, just a few tiny places. Try calling their names, or writing them notes or playing songs you know will trigger them out. Communication is a skill you have to establish, not all of our alters can communicate with each other. It's like you have to build a bridge between each one, or "get their phone number" in your brain, so to speak. When other alters aren't fronting they are just basically asleep for us