How to increase grade of this knowledge?

Görev ile elde edilir. Görevlerde size Tercih sorar siz ise bu tercihlere göre bilgi edinirsiniz.
Yeni karakter açtığınız zaman başka tercihleri seçerek görev tamamlarsanız buna benzer başka görevleride sorunsuz halledebilirsiniz.

So as of february 2023 there is 2 option to get this at S grade:

-You have a character that did the balenos quest before the 2022 rework of those main quest, and specificaly this quest https://bdocodex.com/kr/quest/21002/34/ ; congrats you just have to meet the node manager Grusha with this specific character https://bdocodex.com/kr/npc/50007/1/ , get the knowledge, delete it with another character Annolisa Rosie at calpheon rince and repeat , until you get S.

-You dont have a character with the quest https://bdocodex.com/kr/quest/21002/34/ done, then it'll be way harder (and well you can't do anything about it!). You need to do the beggining of the Ancient stone chamber questline until you reach the gobelin area and specificaly this quest:https://bdocodex.com/kr/quest/21125/65/ (can take ~15min to reach); when completing this quest you'll get the knowledge, so activate all possible bonus grade bonuses you have before completing it(and be sure to have deleted the knowledge aswell)! pray for a S, if you dont got it, delete the character, do a new one , and rince and repeat before S . So as of now its unfairly hard, PA didnt notice this problem when updating those quest, i opened a ticket for that (until i realise that i did got an old character with the "old quest" complete). So maybe you can hope for a "fix" if you read that in the future (which mean PA must update Grusha quest condition,check the Grusha NPC of the first case scenario if you want to be sure).