Researching the distribution wall after launch — what actually happened when you launched?

something i keep seeing across IH: founders who build solid products and then hit a wall when it comes to getting users. the product works, the problem is real, but nothing moves after launch.
i'm doing research on exactly this. specifically:

• what did you actually try in the first 30 days post launch?
• what got even a little signal vs what was a complete waste of time?
• what do you wish you'd known before you launched?

not selling anything. if you're open to a 15 min call this week drop a comment or your twitter handle and i'll reach out