A curl is not a "curl is a curl is a curl".
You have Zottman curls, Spider curls, Hammer curls, Barbell curls, Reverse grip barbell curls, Seated dumbell curls, Alternating dumbell curls, Dumbbell preacher curls, Barbell preacher curls
Bent-over curls, Crucifix cable curls, laying Crucifix cable curls, Seated incline cable curls, Standing cable rope curls, etc.
Mix and match 3 of these(Try to pick 1 supinated grip, 1 neutral grip, and 1 pronated grip, to cover the entire biceps).
Do 5 sets of each(15 sets in total).
You can:
Superset all 3 forms together
Drag out the negatives
Dropset each form until failure
Also, I like to pre-exhaust my forearms before doing biceps...it really burdens my bicep with the full load.
(3x20 dumbell wrist curls, 3x20 reverse-barbell wrist curls). If I have any reverse-grip curls in my regimen, I do them first.