Not every goal needs an announcement. Some plans grow better in the dark for a while.

Telling people gives you a portion of the feeling you were going to get from finishing. The congratulations arrive early, the plan becomes a thing you have talked about rather than a thing you are doing, and you inherit an audience whose expectations now sit on top of it. Some things need that pressure. Many do not.

Keep the next one quiet until it has a first result you could point to. Tell one person if you need somebody to notice. Say the rest afterwards, when you are describing something that exists.