At what point did you stop caring about top-of-funnel traffic and focus purely on retention?

Early on it's so easy to trick yourself into thinking you have traction just because people are visiting your site and creating accounts.

But acquisition means nothing if everyone leaks out the back door a week later.

We used to celebrate every signup milestone until we realized half of them never came back for a second session.

That was the moment we completely stopped marketing and spent two months fixing our core loop instead. How long did it take you to stop chasing vanity numbers and start fixing leakages in your product?