Why does every win at work just disappear?

You call it a lack of team spirit. It isn't. You finish something hard, and by Monday it's as if it never happened. No one mentions it. You move straight to the next fire. This happens because nothing was built to remember it. Belonging is not a feeling you wait for. It is built by small, repeated acts — the same phrase after every win, the same five minutes to name what worked. Without that, every project resets to zero. So does everyone's sense of belonging to something. You may not run this team. You may not set its calendar. But you can start a ritual of one — a habit only you keep — and offer it without demanding anyone join. That is the lever fully within your power. Use it.