Personally, I really like Candace's design. So, I do have vested interest to see her shine.
Currently, there are 2 legit teams which suit her
1. Vape team - Bennett, Xiangling, Sucrose/Kazuha & Candace.
This team focuses on Candace vaping with all her skills; E, Q & CA. That's why you need a lot of pyro applicators.
2. Hyperbloom team - XingQiu, Candace, Dendro & Kuki Shinobu.
This team focuses on turning XingQiu into an on-field DPS thanks to Candace. With Dendro's help to produce Dendro Cores, Kuki can trigger Hyperbloom.
Off-field support is basically providing support, while being off-field.
XingQiu is an off-field DPS.
Guhua Sword: Raincutter's damage is 100% dependent on XingQiu.
That's why after getting at least 200% ER on him, you'd want to max out his damage potentials via crits.
Trying to deal damage with Barbara without vapes...is very inefficient.
I'm still farming in slumbering court, I stupidity discarded hp and Def artifacts lol, need to try on Def and hp scalening characters
I already have polearm archon at lv 87, Ben the Pyro archon should be next after I get yelan or Raiden up to lv >80.