What action closes the feedback loop in sustained contact maintenance with valuable network contacts?

Informing them when you complete training based on their advice.

Sustained contact maintenance requires a system that avoids treating relationships solely as an emergency measure when unemployed. A key component of this long-term strategy is the 'Informational Update.' When you receive actionable advice—such as recommendations for training courses or skill development—and subsequently complete that training, circling back to inform the contact of your progress serves to close the communication loop. This demonstrates tangibly that the time investment they made in advising you yielded concrete, positive results in your development, validating their effort and strengthening the relationship for future interactions.