You make your work visible without sounding self-promotional by talking about the work and its impact, not about yourself. Self-promotion centers the person: look what I did, look how good I am. Visibility centers the outcome: here is the problem, here is what changed, here is what it means for the team. The second one is not bragging. It is information the organization actually needs, and framing it that way is what separates the two.

A few moves make this concrete:

• Lead with the problem, not your role. "We were losing deals at the pricing stage" invites the room in. "I did a great analysis" pushes them out.
• Report outcomes, not effort. Hours worked is about you. The result is about the business, and the result is what people repeat.
• Make it useful to the listener. Share the insight in a form someone can act on or pass along, and your visibility becomes a service rather than a performance.
• Attach specifics. A named number or a concrete before-and-after travels and gets retold. Vague self-praise dies in the room.

The test is simple. If your update would be useful to someone even if it had nothing to do with you, it is visibility. If it only functions as praise, it is promotion. Stay on the first side of that line and you can be highly visible without ever sounding like you are selling yourself.