I think the depth can be had by having authentic vulnerability. But one can never be vulnerable without being extremely powerful first. Its the idea I have been speaking about, where most people are rigid and armoured on the outside and soft and chewy on the inside. The idea is to be opposite. Where one has an incredibly dense yang core like a 1 nano mm sword made of reinforced steel or graphene but the rest of the person would be soft like cotton candy, innocent, soft, everywhere except in the very core. Best example of this is Wonder Woman and how she is pretty much half naked and vulnerable everywhere but carries these tiny bracelets that can avert any kind of danger. Yin everywhere, except a very tiny area which gives her the ability to be super authentically powerful, while being completely vulnerable