18.6 But done having let go Krishna speaks

एतान्यपि तु कर्माणि सङ्गं त्यक्त्वा फलानि च
कर्तव्यानीति मे पार्थ निश्िचतं मतमुत्तमम्

etāny api tu karmāṇi saṅgaṁ tyaktvā phalāni cha
kartavyānīti me pārtha niśhchitaṁ matam uttamam

Even these actions should be done having let go of attachment and of their fruits. This is my settled view.

Explanation

But done having let go.

This is my settled view. Even these actions, done with attachment and fruit released.

The two halves of 18.5 and 18.6 together are the whole book: keep acting, stop collecting. Nothing in eighteen chapters modifies that.