Help for choosing right decision

Hello everyone, I’m building a social networking app with the core features only: posts, reposts, comments, likes, image/video uploads (no messaging, voice calls, or live streaming). My current stack is: FastAPI PostgreSQL Redis PgBouncer Bunny.net for media storage and delivery I’m expecting around 10,000 daily active users, with users constantly posting, reposting, liking, commenting, and refreshing their feeds. My biggest concern is keeping the app fast and responsive as the activity grows. I’m currently