There is nothing to learn - He is the poster child of narcissisim - You cant possible be contrite when you have done nothing wrong - in act put him on a lie detector machine and he will proclaim to be 100% right and unfailing and he will not set the machine off.
I hear what you're saying but I think that description is what he wants his enemies to think. If he truly felt that way he'd be fronting news conferences, giving interviews and generally aggrandising and seeking attention any way he could. But he's totally disappeared - the interviews he's consented to have fallen, and fallen. Since the election he's been almost mute apart from Twitter and a couple of rallies in Georgia (and the fateful one in DC). The Twitter ban has flatlined him. Why not be on daily sycophantic interviews with Fox / OAN / Newsmax trumpeting his bullshit?
Also the crawling deference to dictators (Putin, Erdogan etc.) doesn't make sense either. Maybe I don't know enough about narcissism, but I think he'd be pushing his messaging a lot harder if he was truly teflon coated. I think he's actually just a scared, sad little boy who tries to be a big tough man.