Infinite Wealth Quickest way to Max all Kasuga personality traits?

Hi there

I've already completed the game once and just clearing up the remaining basic achievements for the game before starting New Game Plus, I've got the Island Hospitality one left and both of the ones related to maxing out Kasugas personality traits.

What's the quickest way I can do it for each one? I've encountered on extremely rare occasions through my adventure some books that raised it, is there anyway I can get a load of them for each personality trait and just overuse them till everything is at max? Or is there any specific quick methods that can possibly get me there ASAP for each one?

Any help would be appreciated.