Here is the gold standard. Sattvic tyaga means doing what must be done — simply because it must be done — while releasing all attachment to the outcome. The action continues. The clinging stops. 'Karyam iti' — this is my duty — that single thought drives the sattvic doer.
Picture a doctor in a remote clinic. Patients come, some recover, some do not. The doctor treats each one with the same care. There is no fantasy of fame, no resentment when outcomes are poor, no attachment to the ones who survive. The work continues because it is the right thing to do. That steady, quiet dedication is sattvic tyaga.
This is the beauty of the Gita's teaching. You do not stop working. You do not run away to a forest. You stay right where you are and do your job — but inside, the knot of 'what will I get from this?' is untied.