Haha, I was already about to suggest raising the (suspected) level cap of 99. :D Since I've already played RPG Maker MV JRPGs that feature a higher level cap than 99, it's obviously possible to implement such a higher level cap, but I don't know how much effort that would take you, and an old save file might not be compatible with a higher level cap at that point, especially when the level cap has already been reached.
I'm already 30 hours in and have just begun my raids on the Rifthaven Dungeons, so you'll probably be able to release all future updates before I finish my playthrough. ;)
Speaking of the Rifthaven Dungeons, I thought it was supposed to be a five floors dungeon, but it seems there's an infinite number of floors (unless I gave up too early). And thanks, by the way, for handing out the Seed Rucksacks for free there. :P