Sense of self is quite possibly an illusion a bunch of separate processes in the brain use to organize things. If this is true, changing some of those gradually

Sense of self is quite possibly an illusion a bunch of separate processes in the brain use to organize things. If this is true, changing some of those gradually enough will preserve your sense of self. This is what any experience does to you in various degrees. (Changing them rapidly might conflict with previous memory though.) Even remembering something rewrites that memory and you end up with a slightly different one. So it is possible that not only your body gets completely replaced many times over, but your identity and memories and thinking processes get replaced by imperfect copies.