Guys I lowkey have a genius idea, its groundbreaking here me out.
SO you guys know how all of the mons have a stat cap right? Over time your monsters become extremely reliant on their abilities rather than good stats. What if, we upgrade the crown of spring to also raise the stat cap. Ik it might become extremely broken but it can be a minor stat cap raise, like +100 to stat cap or smth. Or nature synergy can have a 4th level where it not only raises all of the stats but also gives a stat cap raise, like maybe just 50.
Another good idea: An growth type monster.
Basically, it doesnt grow through aurite and stuff, but by battling specific enemies. After defeating those enemies they gain either an ability or stats. This monster can be an end game monster from extreme conditions like getting a bunch of super rare event items to a extremely specific place.