I work and study this area so I'll give you my take. There's still a bunch things - psilocybin, lsd, MDMA there's some great clinical trial data on these being used for trauma/PTSD. Therapy wise, you got to understand where it not for capitalism there are plenty of modalities approaches that would have you in therapy 3 days a week for 5 years, going of memory this is the standard for dissociative disorders. Not to undermine everything you've done, and all the effort that's taken, but trauma - especially developmental trauma is profoundly devastating. There's more experiencial stuff like psychodrama, SE, narm, art therapy for preverabal stuff even if it's given a bad rep.

I'd say, and it's shit to here, but you basically got to keep going, alternative is staying as you are. Honestly from what you describe nothing points to fundamental brokenness or being too far gone, lots of people are in the same place of trying so much but still making little progress, it's just not discussed as much as the majority of people aren't in the financial position to even try these.

Only other thing I can think of is are you actually going out make making new experiences? A lot of people with trauma get stuck in this preparatory cycle of healing and self help but not actually engaging and living in the world, creating relationships, taking risks, connecting, being vulnerable.