i would replace the Effective Mythic with another +30% Weaken (Epic or MS). if you already have one on your Pet, maybe Dodge +10% or something else, but an extra +30% Weaken will really boost your dmg.
not knowing what floor or difficulty level you are on, just keep going until you can’t go any farther and need another build. that being said, Crushing Flames, or CF with Frozen, or similar combinations that beat down a monsters HP quickly are what most players use.
when it comes to farming, you only need a Farm Build to be effective up to floor 500-510 of the difficulty of your choice. maybe up to 1000ish for Legends & Eternals found on higher floors. farming builds for floors any higher are only for bragging rights, in my opinion. i believe there are some Infinity Farm Builds that have been posted.