A legacy isn’t a statue. It’s a habit you kept long enough for people to notice.

What people carry forward from you is usually a pattern rather than an achievement. Somebody being reliably early, always calling back, keeping their word about small things, that is what gets copied and repeated. It has to run long enough to become a known fact about you before anyone picks it up.

Choose one behaviour you would be glad to be known for and simply keep doing it. No announcement is required, since the noticing happens on its own after a year or two. Consistency is the only mechanism at work here.