Which 5* purple to work on next?

I have Sartana and Panther fully maxed and Hel waiting on tabards at 3/70. Wondering which to level next. I have all of the other 5* heroes and they are at level 1 including another Hel, Sartana and Panther. Can anyone help please?

Ascend Another panther and than another hel

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Cheers, mahmut. Thanks