It’s very different for everyone of course and the journey is a mishmash of various aspects of healthier choices (e.g. getting better sleep, eating healthier, getting exercise), dealing with the underlying trauma (e,g, therapy, education, practicing adaptive coping mechanisms), and healing the nervous system (e.g. learning new ways to speak to yourself, finding joyous moments, mindfulness like qigong or meditation).
For many, medication might be necessary too. Checking for underlying physical health issues is extremely helpful.
And most importantly, just not having any judgment or criticism for a while until you can learn not to interpret all of it as personal attacks to the core of who you are. This isn’t always easy, as a lot of it is how you see the world. And when you are in the midst of a breakdown, the world is a very scary place. (In some cases, you are legit in a bad situation beyond your control. In which case, get help!)