Once you take on a purely experiential perspective on what is then the dissolution of all metaphysical entities, external or internal, and the distinction between them becomes inevitable. Every layer of individual identity naturally falls into this, even if at the outset it seems to constitute the fulcrum of your inquiry, and paradoxically while all of this is going on, this infinite reevaluation, nothing needs to change at all. It is the presumed bases, the grounds of experience, its location within a system of reality that changes, while the contents in themselves (but what are they after all?) remain as they ever were, are, and will be.