نَظِّمْ أَعْمَالَكَ وَاحْفَظْ وَعْدَكَ.
Organize your tasks and keep your promises.
Both verbs are commands directed to the same listener. They also share a relevant practical and ethical purpose, making coordination natural. The second command is not a synonym for the first and does not answer an implied question about it.
Deleting the second clause would remove a distinct practical obligation. Here waṣl joins related yet independent directives; its function is substantive rather than ornamental.