No - I'd just quit that content and, if too much content required it, I'd quit the game.
I don't improve just because content wants me to improve. I improve on my own simply because playing better tends to be more fun. It's why I can't really cope with BRD/MCH - I know how I could play them better, but doing so isn't fun, so I ditched the jobs entirely.
And from that base, I engage in content I can comfortably do with my current skill level and ditch the content outside of it. Plain and simple.