Jitsi Meet Self Hosting

Specifications of our self-hosted server
CPU: 8 cores (16 threads)
Memory: 16G
resource (bandwidth): 2G (all available)

In this case, what is the maximum number of participants in one conference room?

This is very hard to answer directly. You can make some estimations and calculations, but speaking from my experience, they are never precise and it’s better to test your platform in real use. Have in mind that a lot of participants in one room means also more load to the clients’ machines, not only to the server.