Post Tue-Thu, 8-10 AM Eastern. Title matters more than content: leads with what you built and what's interesting about it, not your name. "Show HN: I built X, what surprised me about Y" outperforms "Show HN: My new app launched". Reply to every comment in the first 6 hours; engagement keeps you on the front page.
Write a Show HN submission for [product]. Give me 3 title options that lead with what I built and what's interesting about it, not my name or the word launched, plus the best day and time to post and a plan to reply to every comment in the first 6 hours.