A farmer who tends his own field, even clumsily, produces something real. A farmer who abandons his land to go practice someone else's craft produces nothing at all. That is the heart of this verse.
Svadharma means your own duty, shaped by your nature, your abilities, and the situation you find yourself in. It is not about perfection. It is about authenticity. Your imperfect effort in your own lane is worth more than a polished performance in someone else's. The koyal sings; the peacock dances. If the koyal tries to dance, it loses both its song and its dignity.
The verse ends with a striking line: even death in one's own dharma is auspicious, but walking another's path is dangerous. It is a call to courage. Stay on your own road, however rough it gets.