Please share some links or your stories on the topic.
Like this: https://www.ycombinator.com/library/6i-how-to-launch-again-and-again
We launched pre-orders on Google Play and App Store.
It helped us to get 10.000+ organic installs.
Wow, cool! Did you have a working product at that time?
Sure!
That's our product: https://apps.apple.com/us/app/bumpy-meet-new-people-globally/id1455336523