Keep celebrating people after their achievements stop being new to you.

Attention fades much faster for the audience than the work does for the person doing it. Something remarkable becomes ordinary to you within weeks, while they are still living inside it, still maintaining it, still doing the unglamorous part long after the congratulations stopped. Recognition that arrives late is often worth more than recognition that arrived on time.

Think of somebody whose good news you celebrated months ago and say something about it now. Mention the part that has kept going rather than the announcement. Being remembered after the novelty passes tells a person the regard was real.