Join the big groups and use the group chat as foyer to ask for games (as Tomi posted it on the other thread).

Also, Lavos posted here how to see more games:
https://forums.totalwar.org/vb/showthread.php?t=116529

The best thing to do is to make friends and to have a big friend list. And yes IMO you can ask people in your group for a game, that is why they joined it on the first place I would think.