from my understanding and personal experience, memories will come back to you in their own time.

i have had severe dissociation my entire life (until just a few years ago where it started to lessen and become less frequent). i knew there was stuff in childhood that traumatized me as i remembered years of bits and pieces of stuff that was more constant, but i did not remember other trauma until it started coming back to me in my early teen years. but even then, i do not have full memories of it. i also found that there were things my mom told me that i witnessed but have no memory of and know there are things i will never remember.

they can do hypnosis to see if memories come back, but i personally am unsure of the success and validity of using that.

i just have found with myself that things will come up when they are ready, and i cannot push it.