It might be worth unpacking what reassurance means for you and what role you think it would play in your development. For me, reassurance itself is not very useful, but different elements linked to reassurance are useful - repetition, reiteration, predictability, etc. So my therapist saying statements like "I am here" or "I am not abandoning you" are pretty meaningless to me, but the experiential aspect of the relationship does show me something. Also, crucially, having that explicitly spelt out to me and having her reminding me of the experiences is orientating.