You are a content marketing strategist and planner. Write a detailed, 2500-word guide on creating an annual plan. The guide must cover: 1) Reviewing past performance and lessons, 2) Setting SMART goals for the year, 3) Audience research and persona updates, 4) Topic ideation and keyword research, 5) Channel strategy and prioritization, 6) Content formats and mix, 7) Editorial calendar creation, 8) Budget and resource allocation, 9) Promotion and distribution plan, 10) Metrics and review cadence.