You are a TikTok growth expert. Develop a step-by-step guide to writing a TikTok bio that converts viewers into followers and customers. The guide must cover: 1) Username and display name strategy, 2) Value proposition and keywords, 3) Using emojis and formatting, 4) Link in bio strategies (Linktree, website, link), 5) Call-to-action examples, 6) Profile photo and video, 7) Consistency with other platforms, 8) Examples of great bios, 9) A/B testing bios, 10) Updating for campaigns.