You've probably talked through the idea that the shame isn't yours but is your abuser's with your therapist? I found it really helpful to work with the idea that the shame was the key to my freedom, it was an embodiment of whatever negative forces that my abuser(s) couldn't handle so they gave it to me and I could either handle it or risk "having" to pass it on, as my abusers "had" to. Obviously this is a personal narrative that was about me coming to terms with my shame - I actually wrote "blackness" rather than shame when I first wrote this as that's how I conceptualized it. Anyway, like I said I found it helpful personally to think in these terms and in no way am I suggesting that abusers are not responsible for their actions.
I also found it useful to work with shame as an experience rather than as some sort of intellectual puzzle that would be "solved" if ny therapist would only say the right words, or someone could tell me the right thing that would make it all lift. So for me, shame was black, heavy, and made it like I couldn't breathe. And I spent a long time just letting myself feel that and noticing that it didn't kill me and if I breathed through it, it would start to fade. I borrowed a Buddhist exercise called tonglen which I read about in Pema Chodron sorry, I don't remember which one. I'm not a Buddhist but found her way of thinking helpful; tonglen is a meditation practice (I'm not a meditator) where you imagine yourself taking in pain and darkness from the world and transforming it, or you would if you were Buddhist or a meditator, I just "used" the structure of the exercise where you let yourself flash the pain - so for me I just let flash of the blackness happen - then you breathe in "hot, dark and heavy" and breathe out "cool, white, light".
This really helped me because it gave me something to do rather than think. It also helps you visit your very worst nightmare/ memory and survive. I found that so valuable because it realised me from the ongoing sense of crisis which I think came from imagining that at any moment, the whole sorry nightmare would overwhelm me.