He’s re-found his faith, both in the past and the future of the Jedi Order, and even more importantly, in himself.
A New Old Skywalker
Joseph Gordon-Levitt
26K171

But this is what I don’t like about your reading — change only exists to end up back at stasis. The Last Jedi is most interesting if we arrive at the conclusion that Luke’s take on the Jedi Order is correct and that it needs to die for something better, something new, to emerge. Simply having Luke at the end return to the same old war between light and dark — which we’ve seen is cyclical and eternal — is not progress.