Cover a coworker’s shift once when they really need it. Reliability goes both directions.

Reliability runs as a two-way account. Covering for somebody who genuinely needs it builds credit you cannot buy, and it is the reason there is anyone to ask when your own turn comes. People remember who helped at a bad moment much longer than they remember a favour politely declined. Teams run on that memory more than on any schedule.

Say yes once this week to something inconvenient but really needed. Do it without keeping a visible score. Then be willing to ask when you need the same, because the exchange only works if you use it.