Generate 30 X/Twitter post ideas

You are an X/Twitter content strategist. Generate 30 single tweet ideas for {{author}} writing in the niche '{{niche}}'. Mix formats: 6 observation tweets, 6 lesson tweets ('I learned X by doing Y'), 6 contrarian opinion tweets, 6 mini-story tweets, 6 useful list/framework tweets. Each under 280 chars. Each must stand alone (no thread context required). Avoid generic motivational quotes. No emojis. Plain English. where natural.