How to make the architecture for the game?

Question

JavaScript

I am developing a game in which there can be from one to ten players and one host.
All players have the same interface, but the leader has his own.
Games can take place both with minor differences in the rules and differ from each other (the only thing that remains is the leader and the number of players).
The game can be launched locally (on the developer's computer) and also on a remote server, where several hundred thousand games can be created with players and hosts from different parts of the world.
Interested in how to properly make the backend architecture using nodejs, so that it can handle heavy loads, that it is easily supported and modular (in the future, enable / disable the rules of new games).
At the moment, only a browser version is being developed, but various applications are planned in the future.
If anyone has a similar development experience, please write how to develop an architecture for these tasks or throw off links where you can read about it.

Answer 1

Entity-component-system , I think, should be just right.