at least the author adressed the problem so many readers apparently have, why he just doesnt "train more instead of fucking around" (I myself have a problem with this statement, like how killing and/or maiming without coming to an agreement doesnt solve the problem). He literally cant advance quickly enough, because actual major powers in this world are acting against him, they arent weak, the MC just isnt strong enough yet and cultivating takes a long-ass time, thats also why in so many WN, it also increases the lifespan