You don’t need to post a “new me” announcement. Just let them notice.

Announcing a change spends some of the energy the change needed. Telling everyone gives you the feeling of having already done it, and it puts you on a stage where every ordinary bad day becomes a public failure. The quiet version is easier to sustain and harder to abandon.

Let the next month be the evidence. Keep the plan between you and maybe one person who will ask about it. When somebody eventually comments on the difference, you get to just agree, which is far better than having promised it in advance.