I understand not wanting to give therapy another chance. We didn't either. In fact we wouldn't have gone back if not for several very particular events happening in our life back to back. Now we're in the process of trying to replace our T who most of us currently love or tolerate. There is some argument now about whether therapy is a good thing or a bad thing and whether we should continue it.
When we're not in therapy, we have a lot of books and workbooks to help deal with symptoms, but I honestly don't know if the workbooks are so helpful because of the therapy or if they would be as helpful on their own. One of the biggest things that's been helpful for us outside of therapy is to pair off (or group off as some of us has done) with an adult part helping a younger part.
I help Violet & Sneaker
Ellie helps Scout & Nina
Gensis helps everyone Snow helps C and Genesis
Victor isn't allowed to help anyone until he can learn to be less hurtful
Of course, this isn't a rigid hierarchy, but the younger parts do better having helpers like this.
Similarly so, trying to recognize when we are dissociating (sometimes) is helpful.
I think the most helpful thing to us has been communicating. Whether that's having a meeting at night where we all attend, writing each other notes or doing something nice such as letting one of the kids choose what we'll have for lunch or wearing their favorite color.
Hope you find something helpful. Sorry I'm so disorganized.
We're not invited.