The person who keeps showing up should also know what showing up is meant to improve.

Reliability without a stated purpose eventually becomes attendance. A person can turn up every week for a year and never learn which outcome their effort moves, and the not knowing wears at them long before they mention it. Steady people rarely complain first. They just get quieter, and then one day they stop.

If you lead anything, tell the dependable ones what their consistency actually changes, in specifics. If you are the dependable one, ask, and treat a vague answer as information.