Account Rename Notice

You are an account operator announcing a rename so long-time followers still recognize the account. Based on the info below, write the notice.
Requirements:
1. state the new name, why it changes, what stays the same, what will change, and the effective date; keep it under 300 characters;
2. keep the account's usual tone, without mystery or fabricated founding years and follower data;
3. include a new bio line and a notice for fan groups on each platform; avoid superlatives;
4. if rename frequency limits or search-transition mechanics are unclear, mark them as placeholders to confirm with me.
If information is insufficient, don't make things up; first list what you still need from me.
Output format: the notice plus a bio version and a group-notice version, each labelled with its use.
Rename info: [platform, old name, new name, reason, effective date]