i do not know if you have DID or how your dissociation affects you, but have you ever tried DBT? it is used a lot for those with a diagnosis of borderline personality disorder but is also used for other things, though i did wonder if you might have that diagnosis as it's common in it for people to not know who they are, lose their sense of self, and take on the traits of those around them. it also does include a type of dissociation in some. it teaches a lot of different things, mindfulness, etc. which also might be useful for you so you can try to stay more present.

for me, it took a lot of years and big life events for things to change and shift inside of me in order for intense symptoms to lessen enough so that i was able to be just me instead of a swirling mix of other parts/alters. if that never happened, i wouldn't have been able to start figuring out who i was.