One thing you could do it you want to update the build is replacing one of the set affixes with epiphany set affix (if you managed to farm the epiphany legends at floor 650+ on epic+ difficulty.
The set affixes you could remove are nadroji for the epiphany set affi if you don't want nadroji and bonus.
The epiphany set affix at (5) increases the cap by 25%. This means the 200% EXP gain cap turns into 250%. To get that, you of course fill the 6 Quest mythstones in the empty sockets on every gear as well as 4× 15% EXP gain legend affixes from the Ruby Crystal. This will make a monumental difference in getting you to eternal 99 . For me, this made mythic 99 very easy and eternal 99 easier instead of hard. All you would have to do is farm floor 200 with the epiphany and 250% EXP gain and farm on pack size until you've done for any class.
Of course with epiphany, this means more damage too as caps for everything (except all sets) will be increased.