How would you improve retention for a core Meta app?

"The process was more rigorous than anything I’d done at other big tech companies, but the recruiter was accurate and helpful about what to prepare, which I really appreciated. A few things did catch me off guard: one round was more execution- and tradeoff-heavy than I expected, and the bar for structured, concise answers felt very high throughout. Overall, it was challenging but fair, and I came away with a positive impression of the process."