Products go live on a set day and people vote, comment and try them. Most visitors arrive on the day you are featured.
Rankings reset monthly, so a launch on the 1st stays on the board the longest.
Maker's comment: The first comment on your own launch. Who you are, the problem you had, what you built, and a question people can answer.
Link your App Store or Google Play page, or a landing page that links to both. In the workspace, Groivo gives Microlaunch its own App Store campaign link (ct=) and Google Play referrer, so downloads from it show up in App Store Connect and Play Console.