Things that I have found helpful:
Distance and time: it really helped me to communicate on an "as needed" basis. This meant that I had to let go of controlling his time with the kids. This wasn't too difficult to do, as he didn't have them much. Accepting that my kids aren't an extension of me is one of the hardest things I've done, especially as they get older and have their own ideas about things.
Be present-focused as much as possible: My ex did a lot of really awful things that sucked and hurt me very much. I still live in the fallout of some of them. It's quite unfair. However, when I focus on that, it prevents me from enjoying what is right in front of me. He isn't actively doing anything these days to hurt me. I don't want to spend all of my time and energy being A Survivor -- I want to live. It doesn't hurt him in the slightest when I focus on Past Wrongs -- it only hurts me.
Gratitude. Appreciating and accepting what I do have with gratitude has helped immensely. I've trapped myself in states of obsession with "how things should be" and it only made me miserable. This is not the same thing as resignation, and it can coexist with striving.
Write it out. I've only recently come to this, and it has helped even more than just talking it out. Mind you, I had to go through a phase of telling other people the breadth and depth of the abuse too; it was essentially that I stop hiding it. But writing it out and especially noting the places where I kept myself stuck in things has been helping further and I feel free than before.
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