Any way to quickly get 3 lvl 2 crit boost jewels or 3 lvl 4 mixed jewels that have one point each?

long story short i reached Raging Brachy and made the typical mix set with teo parts. Problem is i need 3 crit boost points and two agitator ones wich perfectly fit on the set... But i'm curretnly MR 52 and it is REALLY slow to get ranks in this game.

I don't want to fight alatreon nor fatalis with this set being uncompleted...