Despite playing so many RPG Maker JRPGs, I'm not proficient in using RPG Maker software, but I read somewhere that "Yanfly Core Engine" should enable you to implement a higher level cap. While I'm glad that my playthrough won't be affected, I hope you'll find a satisfying solution when it comes to future games. Just throw in a few permanent stats-up items here and there in this game, which you're probably already planning to do, and I will gladly continue my party's ascension. :)