I don't think there is anything that I would call a "true" self. My perspective is that we have genetic predispositions toward certain things, like personality traits, etc., but we are always a product of our genes in environment (epigenetics). So we can ask ourselves, what might I be like if this particular thing hadn't happened to me, or what might I have been like if I'd been raised in a different environment, had different life experiences, but not who our "true" self is. I do think we can heal from trauma, work to reject internalized biases, change core beliefs that aren't serving us, explore our values and work to align our behaviors/life more closely with them, figure out our preferences, change our environment to some extent, and in doing so, be happier and healthier. It may feel more like we are our "true" selves, because we are following our own preferences, but I think even those preferences are often shaped (or at least influenced) by environment, culture, etc. But! I also think if the construct of a true self resonates and is helpful, then why not?