Okay, so early on in my career, I totally buried a really promising retention strategy because I was chasing those shiny "growth hacking" vanity metrics. We were seeing huge sign-ups, but people were ghosting us within a month. It wasn't until Q3 of Year 1, staring down a brutal churn rate of 65% and realizing our LTV was tanking, that I finally clicked: acquiring users is only half the battle. Th