Have you ever tried hypnosis? People who can experience dissociation are usually able to experience hypnosis. I have recordings on my phone that have a variety of inductions. I have one that is specifically for grounding that is mostly a de-induction. It is simple to make one. I tend to freeze when I am not grounded so my de-induction from this dissociative type state is an account of me doing active enjoyable things in a pleasurable setting. It's just the power of suggestion but it works more often than not. The other things I do are journaling or something physical. In particular I like doing Tai Chi because it is between exercise and meditation.