Three phase is 5 core (l1,l2,l3, N,G) yet my driver only has l1, l2, l3, G. What do I do with Neutral?
Motor drives don't need neutral. So you don't have to wire neutral to them.
3+PE cable is sufficient.

If you have neutral on the drive end of the cable, don't connect it to anything and isolate it according to local regulations as unused core.