Two things came to mind when I read this thread.
The first is, when I cut off my mother, it was a process. I was 19 when the process started and it took years. It took years because every time, after a long while (months) of having cut her off, she had showed changed behaviour so I decided to open up to her again. Bad mistake, as it turned out that every single time, the "change" of behaviour was no real change, but an adaption of her behaviour to make me believe she had changed and to let her back in. As soon as she was back in she was back to her own normal -- which had me cut her off again. As I never had a "real" mother (loving, kind, caring...), the longing for one had never ceased, which is the real reason why I let her back in each time. What I am getting at is: Delaying the cutting off does not spare you any of the pain and hurt and desperateness and whatever else you feel. All it does is delay it. By delaying it, by letting my mother back in several times, I think now, in hindsight, I actually increased the pain, hurt, desperateness, etc.
The second things is that my life has been A LOT better ever since making that final cut. The pain that had come with the cutting off was there for a long while, but the pain that had been present by the abuse was gone. And that has made all the difference ever since. It was worth it for me and my life. It has amazed me thinking about it before writing this post, all that stress gone from my life had left room for positive experiences.
Just my 2 cents. Wishing you well.