I have so many thoughts on this. I have done a fair amount of work in coaching and training survivors of trauma to use their narratives for personal empowerment and social change. These could be written, audio/spoken, or video narratives. My comments below are related to "coming out" as a survivor or going public with one's story.
First, I feel it is very important to have a careful informed consent process to provide space for people to think through the implications of going public with their stories. This is not to discourage anyone, but just to make sure everyone understands the potential risks and benefits of doing so.
Second, the process I teach is about telling the story in such a way as to not re-traumatize oneself. Survivors are encouraged not to go into the "gory details" of their trauma histories (i.e. vivid descriptions of abuse) but to talk about it in a more general way. (Again, this is for public narratives only - in private, people should feel comfortable exploring any and all details they wish, of course). They are encouraged to share "what happened" but also the meaning they have found in their experiences. And also, to share the factors that supported healing, whether it be supportive relationships/community, access to mindfulness or other mind-body modalities, creative expression, etc. In doing so, an important point to make is that healing is not a one-size-fits-all and what may "work" for someone may not be right for someone else. Speakers can encourage other survivors to experiment and find what supports their individual healing process.
And finally, it is great if they can tie in some kind of call to action into the narrative, especially if it is being used for advocacy or awareness-raising purposes.
Also, I encourage folks to think in advance about about self-care strategies before, during, and after sharing one's narrative publicly. Even in the best of circumstances and with the most supportive audience, it can take a physical and emotional toll.