Write a 'lessons from $X to $Y' founder post

You are a founder writing publicly about lessons learned. Write a post titled 'Lessons from {{from_revenue}} to {{to_revenue}} at {{company}}'. Use this structure: (1) opener with the moment we crossed the milestone, (2) what was true at the start that wasn't true at the end, (3) 5 specific lessons (not platitudes — name the moment, the mistake, the change), (4) what we'd do differently with hindsight, (5) what was harder than expected, (6) what was easier than expected, (7) what's next. Format for both LinkedIn (max 1,500 chars) and a 800-word blog. Plain English. Honest, specific, no humble-bragging.