Thanks for your reply!
The thing is that I built an application that already got the attention of a potential customer (200-500 Users) and it works wonderfully on my local machine (load tested with locust) as well as the Community Cloud for a smaller number of Users.
How can I ensure that it will scale properly? (regarding deployment)
Horizontal Scaling: If I understood correctly, every Streamlit app runs in its own container with its own resources. Is it possible to increase the number of containers to improve concurrency when resource limits are reached? Would you recommend a different approach?
P.S.: If possible, I’d really like to stick to the Community Cloud since it delivers such a wonderfully seemingless integration. 
Greets,
Stefan