What's your product doing well, and where does growth stall out?

I work with founders on scaling once the product itself is solid, so I'm always curious what SaaS builders here are dealing with once the initial build is done.

If you've got something live, comment with what it does and where growth has gotten hard, whether that's acquisition, churn, or just not knowing which channel to lean into next. Doesn't need to be a full breakdown, just curious what's actually working versus what's stuck.