My equipment stats are above average, but I don't know how to increase my character stats

Collect knowledge (Boss Rush,star constelation, field knowledge). Enhance Accessoires,totems and relict. Raise black spirit lvl,sylvia statue

I think he asks about how to up his character's skills. Whith mastery Books, ok. But ! Where to find them!?
I play with Titan, reroll, level 52, and I haven't found any of them unless primary Books for family XP.
Thanks for your returns.

Golden skillbooks for your attacks can you obtain in gahaz bandit,farming in the desert or field of valor. Skillbooks also drops at ancient ruins. Gl mate

I have pretty much the same question. Like, I mean all the answers in this thread make sense, however, I’m not sure if they really answer the question. I’ve been all over YT and forum blogposts / QA etc but wtf is Character Stats and how to improve is still a mystery to me 😅