there are a ton of pills to increase breakthrough chance, some found in the starting zone. the "ascension" pills, there's 2 different ones in the starting zone market, each increase breakthrough chance, even more through alchemy. there's also the clear mind pill, and finally individual breakthrough pills for each rank. some are sold, some can be found as loot, all can be made through alchemy. if you want to breakthrough, just spend a bunch of time doing alchemy, and the higher the quality the pill, the higher the breakthrough chance. also there are treasures (the 3rd equip slot) heaven's fortune treasure gives luck and breakthrough chance, get +9 in the 3rd slot and it goes all the way up to 20.6 luck and 3.4% breakthrough chance. might be more, haven't gotten that far quite yet.