As other posters have said, there is no 'true self' or underlying self awaiting ignition. Self improvement doesn't entail becoming who you really are, it involves changing who you actually are. I agree that the adage 'be yourself' is misleading if you take it as a literal translation. Generally I think it refers to not attempting to be someone else on the basis of trying to please another. Only a
PUA guide advising you to dress like a cosplay fanatic would recommend that.