Host office hours for the two most asked about API endpoints
Check your support channel or docs analytics for the two endpoints with the most repeated questions. Schedule a recurring 30 minute office hours session in your community chat focused only on those two endpoints, run by the engineer who owns them, and post a summary thread afterward for anyone who missed it.
Why it works: Narrowing office hours to the endpoints causing the most confusion gets more attendance than a general open Q&A.

